On my 350 Utility, a PO had replaced the original long set screw and jam nut with two short female hex head set screws, one on top of the other. That made for some real head scratching, as it was difficult to see the hole, let alone guess what might be in it. The good news was that I was able to get an allen wrench in there despite the rust/dirt. The even better news was that the wrench did manage to remove the set screw instead of destroying itself. The bad news was that I had no idea the second set screw was also in there. I was lucky I discovered it instead of breaking the pulley.
After adjusting the pulley, I took a bolt (1/4 inch, I think) and manufactured a long, slotted-head, dog-point set screw as close as I could make to the original in the parts book. I added a jam nut and so far, so good.
On my 300 Utility, that set screw was broken off down inside the casting. I'm pretty sure someone used a regular hex head bolt, which allowed them to put enough torque on it to twist it off.
The slotted head on the set screw limits the amount of torque you can apply (a good thing in this case), and having some extra threads visible can come in handy if you ever have to resort to vise grips, etc.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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