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AR tonearm salvage

Posted: 02 Dec 2019 17:09
by Michael626
Hi, I bid and got some misc parts for my AR XA. One part is a tonearm with the cartridge holder broken off into the arm. From the picture, I figured I could just undo the locking collar and take it out. Wrong, some PO glued the cartridge to the fitting at the tone arm. I piddled it with it for too many hours this morning seeing if I could release it but it is not going to happen. Any suggestions on what I can do? Otherwise, the arm is in good shape, wires look fine, the mount is clean and all the parts are there for where it pivots up and down, not sure what that is called. Would soaking it in acetone release the glue, looks like superglue, or would that just melt all the plastic? Thanks

Re: AR tonearm salvage

Posted: 02 Dec 2019 18:23
by vinyl master
You know, I've never encountered this problem (yet), although they say acetone is good for removing glue from metal... :-k

However, it did remind me of a similar situation another poster had with his Dual...


Some other thoughts here might help...


Sometimes, you have to try things...You could start with the acetone, as Alec suggested to the other poster...If that doesn't work somehow and only if there are no plastic parts (all metal collar and tonearm), you could try the heat gun method, but very lightly...In either case, tread carefully...Hopefully, you can get yourself "unstuck" here... 8-[

Re: AR tonearm salvage

Posted: 02 Dec 2019 20:05
by lenjack
I'm wondering if there's a solvent that will dissolve plastic, but not metal. It would be a shame to abandon an otherwise good arm because of this.

Re: AR tonearm salvage

Posted: 02 Dec 2019 23:12
by Michael626
The AR tonearm does have a piece of plastic that is under the locking collar that the cartridge slides into and then the locking collar screws over both of them. The remains of the cartridge is what is glued to that piece of plastic.

Re: AR tonearm salvage

Posted: 05 Dec 2019 15:36
by jdjohn
That is very unfortunate. Acetone is not plastic safe, but isopropyl and denatured alcohol are safe. You might try using one of those, and also heat, but not at the same time! [-X Maybe use a pick to chip away at the glue little-by-little along the way. I'm guessing multiple, repeated attempts will be necessary, but slow and steady might get it loose eventually.

Re: AR tonearm salvage

Posted: 29 Dec 2019 17:03
by 1200y3
It can be swapped out for an SME style head shell.

Too bad you had to break it, because it looked like a good solid contact.

You can try heating the tube with a soldering gun, or glue it back together. (Wiring is probably destroyed, and would need to be run externally.)