Dual 604 Anti Resonator Question

[moondogtn]

I picked up a dual 604 with the anti resonator counterweight. Later, I saw that it was sagging and research began. I’ll try to describe this clearly.
The perpendicular set screw that holds counterweight to to arm is present.

There are two holes in the end of the counterweight assembly itself. One in center and one that I assume will be at 12 o’clock?

There are no screws here.
I assume there should be at least one screw that will go through, tighten up to the bar but and hold the counterweight in place?

Does anyone happen to know the size of that screw?

I’ll double check the manual but did not see exploded view of the counterweight.

I have searched as there are meant threads regarding these issues but none show pics or have screw size(s).

Thanks for any guidance on this.

Bill

 

[moondogtn]

Here are some pics of the guts. I do have the other parts of the counterweight. I am fairly certain I know how this goes back together but don’t know dimensions of that screw that goes through the bar nut.

 

[ear4audio]

Here is a diagram of the 701 counterweight. I don't know how similar it is to the 604, but you may get a better idea of how it is put together.

 

[moondogtn]

Thank you.

That does help confirm what I was thinking. After viewing that cutaway, I looked a bit closer to examine the center screw and mine is there. Now, if I can only determine specs for the outer screw, I can get this thing reassembled and playing.

 

[Tim D]

I repaired mine a few years ago. There is some glue that comes undone in them after years of degradation. It's possible to repair it but it can be tedious.

See post #5 in this thread. Maybe this will help. BTW, this is a common problem with Dual 604's. Other than that it is a fine TT. Mine is in primary rotation right now.

https://audiokarma.org/forums/index.php?threads/refurbing-a-dual-604.836902/

 

[moondogtn]

Tim, I appreciate that. I had stumbled across that thread. Good info! The main issue was the missing screw. It’s about the size of a screw you would use to mount a cartridge.
I decided to lift table off the plinth and luckily the screw was laying in there.
I got that all back together but managed to bend the spring clip by trying to stab that little plastic bit back into tonearm without removing the other portion.
Note: To anyone else doing this....remove c clip and spin that portion all the way off! Then reassemble.

Yes it’s a bit of pain. I looked for an alternate or spare but assumed it would have same issue so figured I was just as well to try to get this one back together.

Table seems to function solidly. I tried to take helpful pics but not sure if these are good enough for that.