JVC Victor Tonearm Counterweight Sag Repair

lewm

Can you clear up the question of Outer Diameter?

"too smart for our own good", you have heard that I expect.

If a washer could clearly SAY, then it would tell you the time hidden mystery contained in the codes clearly MARKED i.e. clearly marked 1/4S

You have erroneously taken the marking ’1/4S’ to mean a diameter. I believe in plumber speak it relates to pipe/valve seat size, here’s several marks which a plumber would understand. The letter (S in our case) may indicate the angle of the bevel.

 

size #00 is 1/2" OD (one half inch outer diameter/diametro exterior)

full text and photos here:

https://www.audiogon.com/systems/12014

The one I used (everbuilt model 866210) (home depot sku 1006959446) has a 5mm diameter center hole which happens to perfectly fit the 5mm diameter shaft of the concealed threaded brass piece. The washer coincidentally happens to be 1/4" overall thickness, the bevel appears to me to approximate a 45 degree slope.

It feels hard, however it is softer than you realize, the force of the counterweight is surprisingly large which is why I noted tighten ’very snugly’ in assembly step C below (otherwise it will sag).

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JVC Victor Counterweight Sag Repair (Tonearms UA-7045 and long version UA-7082)

Three allen head set screws (2 sizes) are involved. (presumably metric, however I bought a 1/16” size key that fit the pair in my arm post that retain the chrome collet).

Only One Repair Part Needed, size #00, ½” OD Beveled Rubber Washer. Note: Inside hole is 5mm diameter, presses onto 5mm diameter brass shaft shown below.

(everbuilt model 866210) (home depot sku 1006959446)

Concealed Brass Piece, 18mm overall length, 8.5mm diameter rubber shoulder fits inside the chrome metal collet, 5mm diameter brass shoulder, threads face the  counterweight.

ASSEMBLY

Three ‘joining’ pieces loosely pre-assembled.

 

1. The concealed brass piece with threads facing the counterweight passes thru the chrome plated metal collet.
2. The rubber washer beveled face presses into the collet and onto the 5mm diameter shaft of the brass piece.
3. Thread the counterweight section very snugly onto the brass threads, compressing the beveled washer.
4.  ‘loosely tighten’ the single allen head set screw to retain the counterweight section’s position. Note: the set screw must be ‘below’ the inner tube’s surface to allow the outer tube to pass over it during balancing/tracking weight setup.
5. Insert into the post, tighten two allen head set screws onto the chrome collet

Note: The notches in the chrome collet face the arm post. The notches originally kept the brass piece from spinning when the counterweight is very snugly tightened onto it. IF it now spins for any reason, simply pre-assemble the counterweight ‘outside’ of the post (when able to grip it with a tool), lastly fasten the completed assembly into the post with the two allen head set screws.

 

 

 

from websters: 'audiophile', too smart for their own good. 

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.

Another Example of 'Expectation Bias'

assume, wish it could say, I am an audiophile, so is the hardware store guy!

put your glasses on: across from the marks ’00’ (not ’’OD’) (letters or numerals?)

which in plumber speak is size # 00 which, as I wrote, as the package is labeled, is 1/2" OD which is for a valve for a 1/4" line. See the washers for larger lines: 3/8; 1/2; 5/8; letters ’S’; ’L’; ’M’, a variety of beveled and curved faces.

 

lewm, others 

for others, it would be good to add to this

A. Set Screw Sizes

1. the size designation of the allen key _______? for the single set screw in the counterweight tube. Assuming someone has to buy one. I had one that fit, I don’t know it’s size designation.

2. 1/16" size designation of the allen key for the pair of set screws in the arm post that retain the chrome plated collet. Is there a metric equivalent _____? to 1/16" that fits those set screws? (I presumed they would be metric sizes)

Kit with 30 pieces SAE and Metric, $14.

SAE SET

 

0.028", 0.035", 0.050", 1/16", 5/64", 3/32", 7/64", 1/8", 9/64", 5/32". 3/16", 7/32", 1/4", 5/16", 3/8".

 

METRIC SET

 

0.7mm, 0.9mm, 1.3mm, 1.5mm, 2mm, 2.5mm, 3mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 7mm, 8mm, 10mm.

 

B. Alternate Photos of the concealed brass piece.

My current one has a rubber shoulder washer covering the flat flange at the end and a 8.5mm diameter rubber shoulder covering the inner brass end. That pushes into the chrome collet’s 8.5mm inner diameter

 

This shows the uncovered end of the brass piece, a bit mis-shapened

Mine came rubber covered, I got lucky. It occurred to me, if the brass is exposed, it could be wrapped (with tape, dental floss, plumber’s teflon tape, ...) to 8.5mm diameter (to both center and isolate it inside the collet) (avoiding metal to metal contact).

Other photos of the OEM part and solutions would be good to gather. I added the one above with my others posted.