So here is how I would do the finish and holes, thread the center with the proper relief. ?Thread it on the spindle, face it square and to fit the chuck recess. ? Put it in the recess then Using a center punch through the chuck locate the first hole, drill and tap it, install one screw, then using a drill bit that just fits inside the threads drill starter holes, remove and finish. ? My chucks that have facing plates have an index recess. ??

pat