On the lathe im fixing is a lot of knobs with knurled heads but they are knurled on a radius not flat -so how do I
After a while of

I figured I already have the tool for it.

So I took a knob cut a small radius at the end and indented the top as the old ones would be leaving something that look like a pumpkin.

The mod of the toool looks like this. Knurling wheel ( fine straight) on a mount with a brass pin to rotate on.

After setting the tool and some (lots) of WD40 applied some presure to the tool and after some gentle rotation it looked like this.


Gerhard