The Mason pinblock was drilled while installed on the plate. This is because the Mason has tuning pin bushings. Actually, this is the way I formerly drilled my pinblocks. If the piano didn't have tuning pin bushings, I installed them.
To accomplish this, the plate is set up outside the piano. I aim for a 3 degree angle on the pin, so the rear of the plate is set lower than the front. My drill press head can be rotated 180 degrees to the rear. My drill press is mounted on a cart with large wheels, and the base is filled with ballast to make it secure when moving.
Drilling through the tuning pin bushings speeds the process if stringing by allowing the stringer to push the pins into the plate, and be held there. Also, there is no chance of the tuning pins holes being miss-aligned. The pictures show the set up.
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