I dont' have a drill press so I do it with a hand held drill. However, I don't just do it in one step, I go up one drill bit size at a time, presumably this will keep my hole centered since the drill bits tapered point is somewhat self-centering. So far, it has worked great. I'm just glad I don't have any of those gas engines that have 8 or 10 bolts to hold the prop. Those guys probably spend more time building and mounting their prop than I do some of my planes

- Joe