as for second guessing repair methods...
by spot welding on a stressed fit, with those splinded stress risers, could make the piece suspectable to crack.
I would have thought a 150F delta interferance fit would been used. (and to facilate changing the clucth, a few drilled and tapped holes around the face for jack screws)
with the splines to transmit torque, a light fit might have been the original design and thus why some are found loose
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