Good Quality ball And Trunnion Boot

eekvonzipper said

Mine was off .007 center to center, checked with a caliper. I'll try to get it closer.

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I am not absolutely sure, but if iirc, the selective shims are used to make the "caps" ends equidistance from the pin, thus centering the trunnion.
If I remember, the pin is terribly hard to center, as it "jumps" as pressed .
Good luck .