I am in the middle of regearing the front, also putting a mini-spool in there too. I am green to these gear swaps.....anyway, i pressed the new pinion race on and went to assemble. I don't know if my compressor is up to it, but it would not tighten all the way (1/64 play, no preload. Is it common to have a shim under the pinion bearing race? Thanks for any help, great place here!