My head diameter is 15/16" so I used a 15/16" hole saw with a stop in in to only go in thickness of head (actually a little less to allow for compression of rubber). Then, I remove the rubber inside the circle cut by the cutter. Takes time but it works great.Only thing I can think of is the wheel will be going over the lip created by countersinking. If thats the case could just shave the whole silent bump off but I highly doubt that the issue is Countersink. Bet those who have trouble have bent studs or loose ones.