zx9
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The pressure on the knurling tool would change as you moved along the taper which would change the appearance anyway, probably able to show that the knurls coincided or not though.Me too, I'm tempted to try knurling a taper to prove there's no magic number.
Edit: Turn the taper with an off set tail stock, that would sort out the pressure change with a push knurl but not a scissor knurl.