I ordered the JG gearbox from airsoft atlanta. The problem is, the bushing holes on the gearbox have to ditch for the edges of the bushings to reside in, making the shimming very tight and inaccurate. Has anyone else had this problem before, or is it common? I am in desperate need of a new gearbox shell right now and I do not want another lemon. The other gearbox shells I have seen that are cheap are from oversea continents from me.