The trick that has worked best for me is to use Snowseal.
I push the screws in from the backside point first, push the pad down on the bench with the heads of the screws heads on the bench.
You will see the tips trying to push through, take the point of a sharp knife, push the screw the other way back out, do the same to both.
Take a round shank screwdriver coat it with snow seal, coat the screws a second time and run in till the heads poke through the back side of the pad.
Place it on the butt end of the stock to get it aligned, Tap with a lite weight the head of each screw.
You now have your marks to drill. Using a #31 drill bit, drill both holes.
Get another screw the same size as the one in the pad. Run it in to both holes to pre-tapp.
Clean the butt face with 91% Alcohol and the face of the pad. Put two spots of glue (top and bottom). Now run in the pad screws.
While you wait for the glue to set, mask the stock with three layers of one inch masking tape. When you are done, you are ready to sand, and get dirty.
