[MOTORHEAD]

Greetings fellow weber masochists :
I have the bellcrank centered on the intake with two short rods going to the L & R master carb, a kit from Peirce Manifolds.
When I try to sync the master & slave with the slave rod the adjustment goes fast when I tighten the lock nuts due to accumulated slop in the threads and the cup & ball joints.
Any one have a cure or procedure for this, or know where I might find a better quality linkage ? ( forget Peirce, they only sell what I have )