Several manufacturers made "Model A" tractors.Oh, well, the procedure is the same no matter WHAT the brand... Take a flat washer, and weld it to the broken stud, burning the weld down into the broken bolt as nuch as possible. Allow it to cool to ambient. Then, weld a nut to the washer, so you have something to grip to turn the broken stud. When it has cooled a little, hold bee's wax or a candle against it, so some melts, and "wicks" down into the threads. Allow it to cool to ambient, then try to rock the nut back and forth with a wrench, hopefully breaking the stud loose and unscrewing it. If the weld breaks off the stud, repeat the procedure. Usually, the stud will break free from the repeated heating and cooling cycles from the welding. A tip... "Easy Outs" aren't, and the use of one of them will, 98% of the time, lead to having to deal with trying to get it's hardened steel, broken remnant out of the still-stuck broken stud! AVOID them!
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