I feel so dumb for asking this (and I did search and got nothing pertinent back), I have a 8-32 x 3/8" Red Acetal thumb screw from the store, and, duh, nominally one would use say the 8-32 drill bit to drill a hole in the holder and let loose the thumb screw fury that is, but I'll be darned if my drillbit set doesn't have an 8-32 size bit...so..for the sake of drilling the proper size hole...what size would I really want to use to ensure a proper fit?