I need a prop adapter for a 3.17mm motor shaft. The motor is at the back of the plane "pushing" I've seen some graupner and aeronaut props with 8mm and 6mm bores that I would like but they recommend a "spinner" adapter. That is for a front mounted engine I would assume and too compicated and heavier than what I want. I'm looking for a simple conversion type adapter that I would mount on the back of the plane. Also I had a question about the thread direction. I would assume that a front mounted adapter should have an opposite thread direction from a rear mounted one. Is that an issue? So do any of you guys know a good place to buy what I'm looking for?