I *think* this should work?
- File off one head of pin
- Slide pin out far enough to clear knuckles to be removed
- Cut off even number of knuckles
- File edges clean.
- Slide pin back into place
- Trim pin to ~1/8" longer than required
- Peen/swage pin
Yep, that works fine. I've re-used a few piano hinges my self.
A few years back my neighbors tossed out an old piano and most of it I've re-used.
I usually just cut it off just past the desired length and spike the last knuckle to hold the pin.
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