I have a new os max .046 ax abl engine that I have installed a dubro 2 1/4" plastic spinner on. The prop nut loosens almost every time I try to start the engine with a power starter. The component parts are added to the prop shaft in this order: Prop drive collar (as supplied with engine), spinner back plate, spinner bushing, propeller, prop washer (supplied with engine), prop nut (supplied with engine) and finally the spinner cone. Is this the proper sequence? Is there a torque specification for the prop nut?

I have tried tightening the prop nut to the point where I am afraid of stripping the thread on the prop shaft and still the prop nut loosens.

Please help,

Terry