I'm going to ask every noob question under the sun, because I really don't know.

Lets say I have a 1.5 sink tube and the corresponding MHS adapter. The adapter is pre-threaded, so when I drill through the sink tube do I need to also thread the tube?

I imagine if I'm using a screw with a head not threading the tube would be fine, but if I want to use one of those hidden screws I would have to thread the tube also so it doesn't just wobble around in there.

How could I thread the tube to make sure the thread lines up with the MHS thread, or is this something that I'm overthinking?

Slightly related: What if I only want to use 2 of the adapter holes, 2 from 1 side of it, how could I maintain stability?