Don't laugh but here's mine.

Looks weird but it's a cut knurling tool for straight knurls, cut knurling tools for diamond knurls have straight wheels.
Yes I know doesn't make sense but it's the geometry and the action.
This one get some serious action when doing straight knurls on motor shafts which have to be dead straight. In the first picture there are two vertical jacking screws that allow you to twist the main spindle carrying the wheel and by this action you can 'steer' it.
Works very well and being a cutting action you don't need the pressures that are normal with crush type tools.
When doing steel I run at about 350 revs and a feed of "Jesus H Christ with a Bridgeport – that was fast "
This is what you get.

So it's not all about looking pretty. 
Edited By John Stevenson on 19/11/2015 18:40:46