I removed the stripped out gear attached to the dial that came with my tuner. I discovered these gears are not brass but a hard phenolic. Perhaps Dumont chose to do that to protect the tuner from over rotation as the teeth would strip out before damage was done to the ceramics in the tuner? I don't know. Through some grinding, drilling, prying and a bit of epoxy, I was able to get the broken gear off my dial, the good gear off the counterclockwise dial and mounted on my dial. We'll see if it works once the epoxy cures. Phenolic gears...that's a new one for me!
Good gear off the wrong dial
Gear transferred and glued to my TV's dial