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I'm having trouble tapping the holes in the main casting (page 8 of the instructions).
I have never done any tapping before.
A test tap I did dug in very slowly, and effectively drilled out a smooth-sided hole, rather than a threaded hole.

I found this guide for tapping metal: https://www.dysoncentre.eng.cam.ac.uk/metal-working/threading/Threading-manual

Should I drill the holes out first e.g. 3.3mm for M4? Some other size?
Cooling or transport liquid?
"half a turn into the material and then a quarter turn back" ?
I bought a set of taps that only has one tap for each size, not 3 different taps for each size. Is this important?

Are there any other options like self-tapping or tap-cutting screws?