Mind if I ask a silly question?
Last time I did knurling was at school (quite a while back) I now wish to create a straight knurl pattern and have a clamp type holder similar in style to the ones above. When creating a diamond pattern its necessary to have a pair of opposite wheels to create the diamond.
Whats required for the straight knurl, 2 of the same or a pattern wheel and a blank/plain dummy wheel for the opposing side?