When I went looking for brake return springs for my Super H, I could not find a spring that was an exact match for the original. Every spring was a little bigger or smaller around, was a little longer or shorter, had the wrong type of hook on the end, used a different diameter wire...
I searched industrial spring supply houses. I searched the Internet. There was nothing out there exactly the same.
Eventually, I settled for a standard spring off the rack at the local hardware store. In fact, I was able to make both springs out of a single $4 spring with a bolt cutter and a pair of vise grips. They work, and if you didn't know any better you wouldn't be able to tell the difference.
Frankly, I don't think you're going to find the scientific specifications of an OEM IH spring. IH didn't publish that information, presumably because they couldn't see a need for it. If you wanted a brake return spring for a 140, you went up to the parts guy and asked for a brake return spring for a 140, not a "30-turn, .156 diameter wire spring with a .6375 end hook and a spring constant of 3.6." (MADE UP SPECIFICATIONS)
If you want original, buy original. IMHO, it's under the platform; nobody's gonna see it if you use hardware store springs.
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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