Knurling Delrin

[gunsmither]

Very nice NCjeeper!
I tried doing them like that, but was afraid to honk down on my imported scissors knurl for fear of snapping it.

 

[whitmore]

Knurling is often used to get a good grip on the object; I'd think of aluminum or steel
if I was looking for grip, because Delrin isn't known for friction.
If, on the other hand, you want a tight fit on a Delrin insert, raising the material
with a scissor knurler would be a good plan.