And now for another installment of the worlds slowest build...
I used the long plug cutter to make a few 1/2" plugs. I then put them in my drill, and spun them while holding a piece of 150 grit sandpaper against them until they made a tapered plug that would fit into a 12mm hole.
I then glued the plugs in the holes.
The plugs don't extend very far into the body, and I did not fill the holes. The new bridge won't be right on top of them, so did didn't worry about having a bit of "empty" under the plugs. (continued next post)