Second Mod. Rusty (aka betapilot) hooked me up with the ESky 3900 motor and Align pinion. The Align pinion is long and at the end with the set screw it tapers out. With this combo you have to shim the motor up so the pinion meshes with the gear in the right spot. One solution is to add washers between the motor and frame. What I did was make a large spacer out of aluminum instead of the two washers. Again, sorry for the cra....py pics. I'll be sure to use the good camera from now on.