Trumpet 3RD Valve Tuning Slide Stop : Reynolds / Olds

I couldn't find another 3rd tuning slide stop for my Reynolds "Special" trumpet. This is an extraordinarily rare horn, but I'm quite hopeful it will fit other trumpets and my best guess would be the Reynolds / Olds line. I'd be interested in hearing from anyone who is able to fit this on their trumpet.

Use of this file or design for commercial purposes is forbidden and you can flatter me by attributing the design to myself.

There are quite a few hidden groves and bumps to help it work a