I made a jig by assembling some 1/2" copper tubing and elbows into a 'C' shape, with the ends of the 'C' in the stock bushings in the arms, then soldered it together. Labeled it and threw it in a drawer for the next guy who comes over needing this job done (been used 3 times now
). The copper fits snugly in the bushing bolt holes.
-Spike

-Spike