Victor UA-7082 Arm OR Micro Seiki MA505L ...? (both fit my existing alternate 270mm hole)

Yes, no one disputes that the Victor tonearm counterweights tend to sag over time.  Happens to the best of us. Chakster used to describe this problem as an indication the tonearm was ruined thereby.  You and several others were able to fix the problem. Good on you. I've got a bag of faucet washers, some of which are tapered when viewed in cross-section.  Perhaps I will give it a shot, though at present I have no use for my Victor UA7045. Maybe there's no Home Depot in Russia.

I found my measurements of the Victor concealed brass piece and measurements of the gasket I found at home depot

I will take the 7082 I just bought apart when I receive it, go again to Home Depot, find the part number, take pics, measure the inside diameter this time.

I'm looking for the part number of the washer in your diagram.  I don't see it.  Do you have the number?  If so, and if you would share the info, that would be great.

Lew; It’s apparently a back burner project for Thom but involves a new machined stub… My enthusiasm for it…whatever it is..has waned over time as my arm went back to Tri last winter for the CF , wire and other upgrades… a hyper clear sonic change for my system anyway…

Re on the fly… and “ grub screw “…. generally i agree…but my 505… the Dynavector is a glorified grub screw….

lewm,

you are the reason I will take it apart and go find a washer that works and make a note of the part number when I do. Arm is about to ship from Japan.

I'm hoping everything is good inside, won't know till I take it apart. If not I have 60 days to return it.