I've bought at least 6 QCTPs over the years (three of them for some specialized tools I've made), both piston and wedge style, both AXA and BXA. As a matter of routine, I always add three more tapped holes to the lock down at 90º intervals. Once it's on the lathe, I simply find the most convenient position for the handle [I'd originally done this to allow moving the handle around for different situations, but it turns out that there's one "sweet spot"]
The process is pretty simple. A shown in the first photo, I unscrew the ball, grab the arm shaft in the chuck, and use it to locate the vise and set the angle. Then (second photo) rotate the arm 90º, drill & tap, rinse & repeat.
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