It's all in the wrist action…
Had the Hemingway Kits sensitive knurler (Marlco copy) kit under the bench for 3 odd years. Thought i'd better make a start.
I've got two knurlers, both are swivel head 3 pairs of knurls type, one a J&S, the other Pratt & Whitney, worked great on Students back in my Blighty workshop days, shanks ground down, and are a bit "beefy" (3/8" wide knurls) for my Boxford and i get inconsistent results.
So, the HK knurler needs narrower knurls, 3/16" according to the drawings. I thought 1/4"will do.
Made a fixture/mandrel for the Stent T&CG workhead.
Spent about 4 hours over 2 afternoons grinding 6 knurls down from 3/8" to 1/4" wide.
That's 0.0625" per side. At about 3-4 passes per thou……