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hey guys so I got a bit of a problem. my ak has almost perfect shimming with sound from the bevel and pinion from the gearbox. the bevel and pinion are meshing perfectly. but the problem is the bevel gear is rubbing on the bottom of the gb. it has about 1.5mm of play. should I add about another .1mm of shims on the bottom? because I'm trying to get the least amount of noise out of my gb. the reason I heard this sound is going from an 11.1v to 7.4v. I mean I'm going to use 9.6v nimh most of the time and I don't want the noise I'm hearing right now.