Ray show us the project when you get done with it. You can do a couple things too like use a thin finishing nail for pivot point so that center hole is not so large. You can also use it so it does not poke through the piece and just pivot on the point so there is no thru hole but a small indent on the bottom. Need to watch feed rate on a scrollsaw because unlike a bandsaw where the blade is constantly moving in a circle, a scroll saw moves up and down and the blade will have a tendency to flair out thus creating an imperfect circle. Wood grain could be a factor also. When doing freehand you compensate for this but when locked into a fixed position it can wander on you. Keep the gang informed.