I can't fit the piston totally through the sleeve yet, but there's more play than I would like. Mabey I'll just get an O.S. .12 or .15. Before I do, I'll run this one as much as possible. Like with my E-MAXX, if I got to get a new one (in the E-MAXX's case, the motors) I might as well watch the old one burn, right? Unfortunatly, the E-MAXX motor won't quit (unlike the MACH .15)! It shouldn't be that hard to destroy the Dynamite though. Thanks for the help!