I bought 2 of the close out HPI Nitro King RTR's and to make a long story short I sent one back to HPI because the engine/clutch bell was not aligned with the spur gear so the gear got chewed up during break-in, the second one's one-way bearing became loose so I had to remove the engine and I put it back after tightening it. The problem now is I cant line the engine/clutch bell up with the spur gear. When I tighten the for engine mounting screws/bolts it doesnt line up and becomes I dont know...jerky and sounds like its stripping the gear. Any secret to this, thanks.

Chris