1. I just use nuts with the nylon lock insert...I haven't seen tie rod ends with the hole drilled through the stud anywhere lately.
2. The slop in the axle probably doesn't have anything to do with either the pivot pin or the bushings. The bushings are welded to the frame, FYI. The C-channel that makes up the axle pivot has spread apart over time, and all you need to do is squeeze it back together. Remove the engine to get better access, and then you'll see a roll pin holding the pivot pin in the front bushing. Remove that, support the front of the tractor, remove the axle pivot pin, and then get a 3/4" bolt and nut, and put that in there without the axle installed. Use that to squeeze the frame back together, and then check the fit of the axle. When you get all the slop out, reinstall the axle, pivot pin, etc.
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