Speed control handle keeps getting loose on my 129
Nearly every time before I use the tractor, I have to tighten the set screw with an allen wrench. It has been staying tight for increasingly shorter intervals. Do I need a new handle (IH-401388-R3) or just a set screw (IH-192454)? I believe I have the correct part # for both items. I've never actually had the handle off, and the set screw is original as well.
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