Replacing Teeth:

I removed some teeth from the great wheel of a clock then restored them. This involved cutting out a slot or dovetail, then a plug to fit, and either soldering or riveting it in place, and finally filing new teeth.

Cutting a slot.

Soldering the plug.

Filing a new tooth using needle files.

Now with two teeth and a dovetail.

This time riveting it in place with a ball peen hammer.

And three teeth…

I found filing the teeth profiles very satisfying.