Because I don't need to use round 8 mm mount, I could modify measuremets a little out of 10x10mm, to 9,5x11 mm, which gives me a little more margin on next step.
I much anticipaed milling the 3 mm oval ....I had ONE 3 mm carbide mill and that has 8 mm cut length. See the problem there when it has to pierce nearly 10 mm.
I drilled the 3 mm hole with carbide drill and expanded the hole 2 mm c-c. I set right table hard stop before drilling and left table stop with 2 mm feeler gauge stack. I advanced mill down in 0,5mm steps and slot in X-axis.
Drilling and tapping went without problems. I tapped both holes trough....I needed to try knobs before comitting to which directions to make clearance holes.
