Thank you, these are always specials.
No matter how simple part looks, there is always something to learn....I made the hole for flexure (the hole at end of the slit) first too small. Needed to turn the know with white fingers to compres it enough to hold the indicator - mildly...Poked it with 10 mm end mill and better, shaved off annother 0,5 mm on each side and I called it good....
Pekka