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The Scrench aka
the Chainsaw Bar wrench
or T wrench
A Scrench or T Bar wrench is a tool intended for adjusting the chain tension on a chain saw, removing the spark plug and making necessary adjustments. It's a versatile little tool thats does the job of 2 wrenches and a screwdriver. The Scrench is not restricted to the chain saw. It's good as a maintenance tool for small gas engine powered grass trimmers, leaf blowers and even Go Karts. You can even change the spark plugs in your car with it if you have 19mm Spark Plugs in it. It's a worthwhile, versatile, universal little tool to carry around everywhere you go.
Scrench Usage 1 Scrench Usage 2 Scrench Usage 2
It can be used to remove the Spark Plugs from Weed Wackers They fit the spark plugs for Leaf Blowers as well as Chain Saws. Note how the thin body gets deep into the plastic case to reach the plug. A view of the wrench end. Click any of the pictures to see larger image.

In the chart below, I have tried to cross reference various types with manufacturers of chain saws so it's a little bit easier for the individual to figure out what size will fit their equipment.

19 X 10 SCRENCHES

SIZE
PART NO
USED ON
FOR MODELS
19 X 10 (3/4" X 13/32")
19 x 17 (3/4
JPM-108
ECHO
CS-280, 290, 300, 301, 302, 315, 330, 351, 400, 440, 2800, 2900, 3000, 3450
JOHN DEERE
30, 40
OLYMPYK
234, 240, 241, 244, 935DF, OLE200, E140F


19 X 13 SCRENCHES

SIZE
PART NO
USED ON
FOR MODELS
19 X 13 (3/4" X 1/2")
19mm x 13mm (3/4
JPM-104
ECHO
500,510, 550, 650, 660,701,750, 4600, 5500, CS8000
DOLMAR
118
HUSQVARNA
NEWER 32, 36R, 38, 40, 44, 50, 51, 60, 61, OLDER 65, 66, 77, 160, 162, 165R, 165RX, 166, 180, 181, 185, 240, 262, 263, 266, 268, 281, 285, 288, 298, 380, 480, 1100, 2100, 2101, 3120
POULAN
25 series, PP235 THRU PP655, 285, 305, 335, 336, 365, 1800, 2000, 2300, 2800, 3000, 4000, 6900, 7700, 8500
JOHN DEERE
8, 9, 12, 15, 50, 60, 70
JONSERED
49, 50, 52, 52, 450, 451, 510 (OLD), 455, 490, 525, 521, 535, 590, 625, 62511, 630, 630s11, 670, 670C, 670S11, 2036, 2040, 2041, 2045, 2050, 2051, 2054, 2055, 2077, 2083
PARTNER
R16 THRU R40, 420, S50, S55, S65, P70
STIHL

NOTE: SOME STIHL SAWS USE T27 TORX FASTENERS, IF SO, USE SCRENCHES IN TABLE BELOW
E10, 009, 010, 011, 015, 020

19 X T27 TORX SCRENCHES
SIZE
PART NO
USED ON
FOR MODELS
19 X T27 TORX
JPM-103
OREGON
See description for STIHL below
STIHL
Fix all of the latest Stihl saws with Torx fasteners. 19mm barrel will remove bar nuts and spark plug while torx head will accommodate all other bolts on saw (except cylinder head bolts).

19 X 14 SCRENCHES

SIZE
PART NO
USED ON
FOR MODELS
19 X 14 (3/4" X 5/8")
JPM-103
LOMARD
COMANGO, SUPER LIGHTNING
POULAN
200, 300 400, 405, 655, 3400, 3700


19 X 16 SCRENCHES

SIZE
PART NO
USED ON
FOR MODELS
19 X 16 (3/4" X 5/8")
JPM-103
HOMELITE
1000 SERIES, XL 12 SERIES, XL 120 SERIES, XL 800-900 , XL 102,35,330,350,360,410,450,550,125 SERIE, EZ MINI, XL MINI
MCCULLOCH
100 Series, Eager Beaver 2, 600 ?, 605 ?, 610 ?, 650 ?,


19 X 17 SCRENCHES

SIZE
PART NO
USED ON
FOR MODELS
19 X 17 (3/4" x 11/16")
JPM-109
ECHO
1001
DOLMAR
122, 144
STIHL
051, 075 (OLDER), 076, TS510

Wrench and Spark Plug Sizes for US/Imperial Nuts & Bolts

This next chart should be very helpful if you need to figure out what bolt size corresponds to each wrench size. It also helps you if you need to order new nuts because nuts are purchased based on the bolt size. Nuts can get lost or the threads can become damaged. This chart will help you find the right nut size based on the wrench you used to remove it.

Scrench or Wrench size
Fits nuts for this bolt size
Possible thread sizes
3/16" (.183")
#2, #3

1/4" (.250")
#4
#4-40
5/16" (.312")
#6
#6-32
11/32" (.34325")
#8
#8-24, #8-32
3/8" (.375")
#10
#10-24, #10-32
13/32" (.4062")
Metric 10mm
Metric M10 x 1.25
7/16" (.4375")
1/4" (.250")
1/4"-20, 1/4"-28
1/2" (.500")
5/16" (.312")
5/16"-18
9/16" (.5625")
3/8" (.375")
3/8"-16
5/8" (.625")

Common Spark Plug Size
7/16" (.4375")
7/16"-20
11/16" (.6875")
Metric 18mm
Metric M18 x 1.5
3/4" (.750")

Common Spark Plug Size
1/2" (.500")
1/2"-13
13/16"

Common Spark Plug Size


Since you can have bolts of the same diameter with different thread types you need to check the thread so you know what to ask for. If you are able to locate the bolt you are trying to find a nut for, use your measuring tape and lay the bolt down on it stopping at the first inch mark. Count the number of threads in one inch and refer to the chart. The second number after the bolt size is the number of threads per inch. With all the products being made in China these, you are probably going to run into some metric threads. I have listed a couple but you really need thread guages to determine what metric thread you have, or you could take the bolt with you and try it out on a few metric nuts that are close in diameter.

Reccomended Torques for Spark Plug Installation
10mm with Gasket
12mm with
Gasket
14mm with
Gasket
14mm with
Tapered Seat
18mm with
Gasket
18mm with
Tapered Seat
8-11 ft lb.
12-15 ft lb.
19-22 ft lb.
12-15 ft lb.
20-23 ft lb.
14-17 ft lb.

Spark Plug sizes removeable with the Scrench

Screnches are primarily designed to remove 10mm and 12mm Spark Plugs which are commonly used in small gas engine tools such as Chainsaws, Weed Wackers and Leaf Blowers. Screnches may not fit the spark plugs used in your Lawnmower or Car or Motorcycle. These may use Spark Plugs requiring 21mm or 13/16" wrench size or 27mm or 1-1/8" wrench size. The chart below summarizes the different thread styles for SAE Standard spark plugs.

Spark Plug Thread Size
Wrench Size in mm
Wrench Size in Inches
M18 x 1.5
27
1-1/8"
M14 x 1.25
22
7/8"
M12 x 1.25
19
3/4"
M10 x 1.0
17
5/8"

Torx fasteners used in Modern Chainsaws and other Gas Engine powered devices

Some chain saws manufacturers such as Stihl and Oregon have started using "Torx" fasteners on their models. Screnches have been made with the T-27 Torx bit that is required. This chart gives you a cross reference between existing fasteners and Torx fasteners. The chart will tell what size bolts you are likely to find in your saw if the T-27 bit fits them.

Torx Close Up

TORX SCREW SIZE CHART
Screw
Size

Torx
Socket
Set Screw

Torx
Socket
Cap Screw

 Torx
Pan
Head Screw		 Torx
Flat
Head Screw		 Torx
Fillister
Head Screw		 Torx
Truss
Head Screw		 Torx
Oval
Head Screw		 Torx
Hex
Head Screw		 Torx
Internal
Washer
Head Screw
#2 T3 - T7 T6 - - - - T7
#3 T5 - T8 T7 - - - - T8
#4 T6 T10 T9 T8 T9 - - T9 T9
#5 T7 T10 T10 T9 T10 - T10 T10 T10
#6 T7 T15 T15 T10 T15 T10 T15 T15 T15
#8 T8 T25 T20 T15 T20 T15 T20 T20 T20
#10 T10 T27 T25 T20 T25 T20 T25 T25 T25
#12 T10 T27 T27 T25 T27 T25 T27 T27 T27
1/4 T20 T30 T30 T27 T30 T27 T30 T30 T30
5/16 T27 T45 - T40 T40 T30 T40 T40 -
3/8 T30 T50 T45 T40 T45 T40 T45 T45 -
7/16 T40 T55 T50 T50 T50 T45 T50 - -
1/2 T45 T55 T55 T55 T55 T50 T50 - -

Some Scrench and Chainsaw Wrench Sales taking place on Ebay right now...

Click here to return to the home page from the scrench page

 
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  • Indiegogo and the Bully Busters

    The story of the bullied school bus monitor Karen Klein receiving $600,000 in donations is a fascinating one to me. It speaks to the turbocharging of social response on so many levels. Not the least of which is how people now view so called crowdsource funding sites such as Indiegogo.com, the site used to raise the enormous donations for the bullied grandmother.

    Crowdsourcing is fundraising for the 21st century. Put your request for money on a well established, well connected website and hopefully enough visitors will see your request and feel compelled to donate funds. Even if only a dollar or two is given, the total return can be mind boggling when multiplied across all the social networks.

    The request can be a compassionate appeal to fund treatment for a cancer victim, a vacation for a bullied grandmother, a new band that needs money for equipment, a start-up brewery looking for venture capital, a new product or anything really. Indiegogo caters to all of this.

    Indiegogo is in the fundraising business. They provide the merchant credit card account and collect the money people donate after being motivated by your appeal. They typically charge a 4% fee as long as your appeal is successful. An additional 3% is charged to cover the credit card transaction fees. In the case the of the grandmother, the appeal was for $5000 to be collected in 30 days.

    As of this writing the bullying video has attracted $600,000 and still has 28 days to run ! It is likely to be the largest amount of money Indiegogo has raised to date as far as I can tell. It is likely that $42,000 will be charged in fees and the remaining funds will be deposited in the bank account of Max Sidorov. The Toronto man who manages the fundraising account. Mr. Sidorov has promised to pass all this money along to Karen Klein to use as she chooses.

    Signup for Indiegogo is free and you can do so using your Facebook account. You also need a valid bank account where the funds you collect will be deposited. There are no limits or restrictions on what you can raise money for. Indiegogo allows you to choose different collection methods. If you do not reach your funding goal, you can opt to have all the money returned to those who donated or you can choose to keep the money regardless.

    Indiegogo uses an algorithm, much like Google's search engine, to determine the ranking or wow factor of your particular appeal for money. That algorithm took immediate notice, when millions of visitors paid attention to he bullied grandmother video on YouTube

    Indiegogo is originally launched in 2008 by wall street analyst Danae Ringelmann at the Sundance Film Festival with the idea of atracting funding for independant movie projects. Now based out of San Francisco, California, It recently received $15 million in venture capital funding making it one of the worlds largest crowdfunding sites.

    Now a well respected and well connected website with over 200,000 visitors per month. Alexa ranks it the 3544 th most important site on the internet, Indiegogo has over 18,500 influential websites linkng to it . The site won a “Webby award” for excellence and for setting the standard for innovation and creativity on the internet. in 2010. Having access to such a powerful website for free is extremely compelling for the budding fundrasiser.

    Aside from all the wonderful things they do for fundraising, Crowdsourcing sites do raise some ethical concerns. For one thing, what if a campaign turns out to be scam ? There are no checks and balances to make sure if a request for money really is valid especially when these requests are mixed of “for profit “ ventures.

    Government registered not for profit charities must abide by strict rules and regulations but sites like Indiegogo face no such restrictions outside of public pressure. It is possible for compassionate people to be taken in by others pretending to be sick or dying simply by how polished the appeal is and by the peer pressure of friends and acquaintances.

    Regardless, Crowdsourcing does put funding right at the fingertips of the individual, it totally democratizes the process of raising money. If you want to be altruistic, and offer support to causes you truly believe in such as Bullying, its totally up to you. 

    Crowdsourcing is here to stay.

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