The litmus test on whether the carriage bolts are "correct" would be:
Is the square part of the carriage bolt engaged in a square hole? On a seat flip bracket, that answer is "no."
They used 1/2" because the holes were "wallered" out.
They used carriage bolts because that's what was on hand when a longer bolt was needed. Even now, there are always long carriage bolts on hand at the farm, but long hex-head bolts are hard to find.
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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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