My #1 recommendation, don't do any conversions from metric/inches. Get feeler gauges in metric sizes, in .01 mm increments. The shims come in .025 mm increments, if you use feeler gauges with .025 mm increments you may find the valves still out of spec after you put the cams back in. I did.
interesting note,
I couldn't find feeler in .025mm increment nor would I want them anyways.... oh wait, I have some....(.025mm = .000984")
based on the feelerstock available, the smallest metric measurment you can access is .03mm...
why don't they make metric feeler stock less than .03mm?
.03MM= .00118"
.04MM= .00158"
.05MM= .00197"
.06MM= .00236"
.07MM= .00276"
.08MM= .00315"
.09MM= .00354"
.10MM= .00394"
.15mm= .00591"
most sets all jump to .05mm increments (.002") from .15mm to .60mmhttp://www.mcmaster.com/#metric-feeler-gauges/=kpesolindividual feeler stock:
http://www.mcmaster.com/#feeler-gauges/=kpf980as long as I can use my brain, and simple math, I will still use my inch feeler sets, and individual strips i have purchased in inch increments, which will let me measure .0005"
besides that, my micrometers measure to the .0001", and that works for me also...
I use it to measure the shims....and also the thickness of the head on the buckets the cam lobes push on.......