SME 20/2 Finger Lift Hum

It's certainly a workable solution since it's what I am doing and when actually playing a record it sounds fantastic, but I will still be experimenting until I find a 'permanent' solution. The concern about the tight and rigid coupling with the Lyra to the headshell being compromised is a concern of mine as well if nylon screws are used. Thanks for all the advice. We'll see where this goes.

All grounding effects have been tried (on the SME there are three into two grounding cables from the arm). None, either one, both. No change. Checking additional items, there is no hum (and it is a hum, not a high pitched sound) at the arm tube, headshell or cartridge body. But there is at the finger lift, tops of the headshell bolts and the front bolt on the Lyra. For now, have insulated the finger arm with plastic, but would like a permanent solution. That could be a new cartridge or replacement of the stainless steel bolts/screws with non-conductive bolts/screws (nylon or carbon fiber?). Has anyone tried that and if so where to procure? Thank you.

I like the heat shrink option (if I can't eliminate the hum source) for better aesthetics and will also check out the rubber shoes/mat just to see what happens (more evidence).

I must not be as skilled:)