Just got a ARF electric Cesna and I'm trying to mount the prop correctly. The instructions say %^&*^% or something like that! The motor shaft is threaded and the prop came with three nuts and one flat washer. The prop has indentations on both sides that recieve hex nuts. My question is, shoud I mount the prop with the nuts on both sides and into the indentations and a third nut outside with the flat washer between the nut and the prop? How much clearance should I have between the prop and the nose? Hope my questions are not as vague as the instructions. Thanks.