I had the same problem with my set screw for the kick up fins. I was able to remove the old set screw by drilling a small hole in the center of it and inserting a small bolt. The drill that i used was 3/32 and the bolt was a M3-0.5x16mm Socket Cap Screw, which I purchased at Home Depot. I threaded a small nut onto the cap screw and then put on a small toothed washer. I screwed this assembly through the hole I had made in the plastic set screw using an Allen wrench. When the screw projected through to the other end of the set screw, I put on another small toothed washer and a small nut. I tightened the nut that was accessible to me essentially sandwiching the plastic set screw between the two nuts and the two toothed washers. Prior to doing any of this I had sprayed WD-40 on the set screw and let it sit overnight. I had to tighten the nut quite a bit to get the toothed washers to dig into the plastic of the set screw. After the nut was well tightened, I turned the cap screw counterclockwise, and the set screw came out. I don't know what size of the toothed washers were, but they have to be smaller than the inside of the threads of the plastic set screw so that they won't bind on the plastic housing. The drill hole needs to be centered as accurately as possible as well. I have some photos of it but I'm not sure how to attach them.
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