Tonearm adjustments on the fly

The tonearm tube is internally damped with a strip of felt and the SME type removable headshell is gripped by a collet arrangement.

But above all the barrel has undergone an incredible surface treatment that is not conductive to further shield the cables that pass inside from radio and Emi interference that propagate in the air, it is sufficient to try with a tester to see that there is no it is conduction.
When some manufacturers painted the barrel to make them non-conductive, Victor had adopted a valid and expensive method of treatment.
https://i.postimg.cc/Gmr3Nb7Q/A.jpg

That treatment is nothing more than anodizing, a fairly standard finish used to protect the aluminum surface from oxidation. It forms aluminum oxide on the surface and that is not electrically conductive. The thicker the layer the more insulating property it has. I've seen heatsinks that have been treated this way just for that purpose.Ever try drilling a hole through aluminum that has a fairly thick anodized surface? The drill will squeal and protest until it has broken through that hard layer. Aluminum oxide is also used in certain sand paper.

BillWojo

I've done that very thing! Had to grind the bit to give it a new edge. 

It forms aluminum oxide on the surface and that is not electrically conductive. The thicker the layer the more insulating property it has.

Exactly.