[morzh]

I tried to twist them again.
Before I did I measured the resistance and in one can it was still 1k or so.

I aplieed the twisting effort to every one of the 6 cans, none really twisted or even snapped a little, but I think this effort was just enough to break the aluminum oxide or whatever it is that formed in between the cans and the chassis. After the re-measurement I can see that the resistance of each can is between 0.25 to 0.4 Ohm (0.2 is the meter's leads resistance).

Now not that it affected the performance - no, I do not think it did, but at least now when I touch a can, I hear a reduction in volume no matter which can I touch. Before some cans I touch would increase the volume and others would decrease it - this was what prompted me to check the grounding.

Well, it is not that important but I like things in order and functioning as intended to the best of my knowledge and ability, and not the way they want to function, which is usually "leave us alone - we do not want to work at all".



PS. I will probably still get some of that EMI gasketing, just to make it reliable.