JVC Victor Tonearm Counterweight Sag Repair

I acquired my UA7 series tonearm as a piece of a QL10 ensemble, which I bought only to get my hands on the TT101 chassis. After I much modified the QL10 plinth and finally fixed my TT101, I am using it for my Koetsu Urushi.  The very high mass Fidelity Research FR64S with Ortofon LH9000 headshell and B60 base seemed more appropriate for mounting the Koetsu, and I have been very pleased with the results while the UA tonearm sits idle with its counterweight at half mast.  However, by examination, I agree it is a very nicely made tonearm, superior in many ways in terms of quality of construction to some of the high end most costly tonearms we have today. It is well worth repairing.  What do you suppose is its effective mass, assuming a run of the mill headshell of about 10g? Unsubstantiated rumor has it being medium to low mass.

First, I’m not the least bit angry about this, but why do you seem to be? In fact, I am grateful for your guidance. Especially since only you and I seem to care. What you fail to understand is that the photo on the right showing a bunch of black washers most prominently displays a washer that appears to be 1/4” OD. Whereas the packing shown on the left does clearly state that it contains washers with 1/2” OD. That is why I sought clarification. That was my only point. Anyway I obeyed the package label and bought 1/2” OD.

I am not a plumber, although I can fix a toilet and change a washer.  However, the black washer in your photo says "1/4S" and across from that marking are the letters "OD".  This suggests to me that that washer is 0.25 inches in Outer Diameter.  It suggested the same to the hardware store guy who agreed with me.  (I printed the photo you posted to be sure of getting it right.) Neither of us had a clue as to the meaning of "S". (This hardware store does not carry the exact "Everbuilt" brand, but they have a wide variety of beveled washers from which to choose.). On the other hand, we have the photo of the Everbuilt container showing the 1/2" OD claim. I chose the correct OD only because I think 1/4" is too small.

I picked up some washers at my local hardware store that at least meet the spec of the washers in your photo. The container shownin the photo says "1/2 in OD".  But the washers shown on the right hand side clearly say "1/4 (meaning 1/4 inch) OD".  Although this is ambiguous, I opted for the 1/2 in OD version.  What strikes me, besides the ambiguity in relation to OD, is how hard and stiff these washers are. In fact, I would like to be that hard and stiff.  Can you clear up the question of Outer Diameter?