I'm embarrassed to admit this...but I "rebuilt" my studs recently. I ordered new studs with linkages from Moss, and then TRF, but the rods with studs were a completely different style than the original. So I returned them. Then I welded up the flat worn areas on the old studs, chucked them in a hand drill and spun them as I used a bench grinder to reshape the ball. They came out perfect, but what a lot of time in ordering, returning, welding, and grinding!