Thank you very much.
I was eyeballing and estimating the Rahn version, but based on my past experience I very much prefer drilled/reamed hole to terminate such a cut.
I'm drawing parts based on 100+100 spacing. Bit torn between ballbearing balls pressed on tight holes (I have a fitting drill) or going trough unused circular inserts for lathe/mill. I have proper screws, drills/taps. Might be easier that way.
I have very nice Mitutoyo 2109S-10 0,001 mm resolution indicator, but reading is a bit tight and i doubt that this would benefit that much linearity....very tempted to use cheap 0,001 mm resolution dial on this one.
Hope that this flu does not get worse. This might be just the right weekend project.
HRS is 20*50 mm and then I have some 5*50 mm for spacers. Can't find any 10(or 12) mm *50 mm for DTI arm and other parts, should hit junkyard, but it is closing early today.
Pekka