I used a cheapo hand drill and a lot of attention on my part, keep the drilll square to the drum. With 1/2" stud you will need the 11/16" hole saw, 5/8" is to tight and will cut the threads. Cutting oil!
While installing the new drums you may have to "clean up" the studs to get the drum all the way on.
Ace hardware for the holesaw $7-8
