BTDT.
FWIW, in the newer TSW guns the frames were machined on the double column mag models allowing the original mag catch to be switched (and flipped) to the other side. The machining requirements and dimensions of the .45 frames (same as the 10mm's) however, and required that a different part be used when switching the gun to left-handed mag release orientation.
I guess that makes 3 of us in this thread, now, huh?