Guys would this idea work for the prop slippage problem? What if you took the two allen head screws out of the hub and drilled the backplate of the spinner the same as the hub. Then use longer screws and actually bolt the backplate to the hub. The prop could then be drilled to accept the protruding heads of the bolts and act as anti-rotation pins. The only problem may be shearing between the backplate and the hub which may cause the bolts to fail, but if you got the prop nut tight enough....? Just a thought, that I don't think I have seen yet. What do you think?