Guys

At times I have the need to enlarge prop mounting holes, normally a prop reamer is sufficient, however I now require the holes to be enlarged from 10mm to 12mm (typical) in the past I have used my drill press using several increasing sizes of drill bits which has been relatively successful. As I said although this has worked, is there a sure fire method that would remove the pucker factor from the procedure, ie is there a jig or process that would ensure that the holes are accurate each and every time?

Thanks and regards.

Peter