I wouldn't be surprised if both pins wind up on the plugs. When I discovered pinning it was such an eye opener. "SO THAT"S how they can bang away and whammy and still stay in tune"!!!
I just Saw The Rev in Maryland at a festival and got a chance to talk to him. "Gotta pin my bridges" He said. I laughed.
I can't wait to see how your build turns out. I'll always have a spot in my heart for Gretsches.