I used to shim my universals to lessen the gap between the hex drive and the upright for my front wheels on a DB-01..
Later I took out the shims and started balancing my wheels.. The wheel balancing has been superior since the centrifugal force eliminates any wheel wobble that may exist while the car is in motion.
If the universals are shimmed and the tires are not balanced, then the shims can only serve to fight against the wheel vibration.
Balancing your tires is better overall because it also ensures better traction..
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