Replacing the aluminium gear and the worm gear with both bearings and race. when i put these new parts in circle drive can i just put the shims back how they were? or if i wanted to use new shims can i just check the thickness of the old ones with a caliper and get the same thickness with the new one? the bearing were good the only thing bad was the worn gear and aluminium gear because teeth of the aluminuin gear broke of damaging the worm gear. this circle drive has the clutch plates.