I stand corrected about it being a roller tip, I probably was in need of a nap. I do like the alternative using a certain number of turns as a gauge as well, seems the nicer tappet adjusters have some marking on their sides which could support that technique.The rollers are at the cam end of the rocker on the Hima
But the adjuster on the other end of the rocker can cause spot wear on whatever it pushes down on, so feeler gauges wont necessarily give the correct reading.
Which is why some folks like to set the clearance by measuring the amount you turn the adjuster - I still have pops auto adjuster which had 1 thou clicks on the knob, but not enough room for it on the Hima.
But a 1/4 ex and 1/8 in of a turn out from touching is not going to make a noticeable difference to the noise.