get a set of racers edge washers that fit in the racing og your CB bearing....they will alow you to tighten down the screw w/o putting pressure on the bearing plate just the center race......I tell everyone near me to get a set of those and a set of the Kyosho shims, they give you 3 thicknesses in the shims....between those 2 sets you'll be able to get it perfectly shimmed...and use good bearings too.....