Last night, it came to me: the "HANDROK™".
- It's small enough to fit in the palm of the hand.
- It can be used to knock down high spots, rub out creases in brass instrument bells, burnish pistons/rotors, chip off small pieces to use as replacement finger pearls, and several other applications.
- In the realm of woodwind repair, it can be used to adjust stubborn piccolos.
BEFORE:

AFTER:
