I made this up to drill through the keyway in the main drive gear so I could install a pin rather than rely on locktite. I kept having trouble with the locktite breaking loose. It is just a piece of aluminum bored out to fit the gear with the insert installed and slit so it would clamp and hold the gear in the vise. I soldered the pin in with hiforce 44 solder, no more problems with the gear.
