You guys are handy. This is not really a conversion but a resurection. I traded into an old G38 with a bent crank. Somebody beat on it and really messed it up. After much fiddling I sprang for a new crank. I trued the steel prop hub. Thing is I do not like drilling holes in my props. I would like to make an aluminum prop hub, easy enough. Toni Clark has a good design on his web page, see attached. My only puzzlemant is how to index the holes in the hub for the two set screws. Did he use a ring on a shoulder? Unless you got it perfect the torque on the hub would not be right to align the setscrews that mate with the flywheel. Or, did he use a female thread in the prop stud that slips in a bore in the hub? The two screws then serve to hold the hub against he flywheel?