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.
Radius knurling?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.
Radius knurling?The mod of the toool looks like this. Knurling wheel ( fine straight) on a mount with a brass pin to rotate on.
Radius knurling?After setting the tool and some (lots) of WD40 applied some presure to the tool and after some gentle rotation it looked like this.
Radius knurling?
Radius knurling?Gerhard