4200XL Pump Motor Problem

[Espeefan]

You could also try filing or grinding a small flat on the shaft, where the setscrew would make contact. Or maybe do that, and drill a small dimple on the flat as well.

[A1 Dirt]

Thanks for the suggestions. The problem has been solved. Just after I ordered set screws, etc., RC4WD decided to send me a new motor. Hopefully, I can get it all back together so it doesn't come apart. Lots of threadlock!