help needed for a glued headshell

snap, crackle and pop
Massimiliano
member
member
Posts: 42
Joined: 17 May 2010 21:01
Location: near Venice

help needed for a glued headshell

Post by Massimiliano » 30 May 2018 19:36

I'm purchasing this old Lesa MTT, a beauty that is a true rarity in Italy. It seems to be in good shape for his age, BUT some idiot glued the headshell using a red glue, probably epoxy resin. My problem is: how to remove the glue without destroying the shell and/or the tonearm, in order to fix properly this mess?
Thank You all very much!
MTT guaio.jpg
(49.57 KiB) Downloaded 458 times
MTT Torino.jpg
(124.73 KiB) Downloaded 456 times

Spinner45
long player
long player
Posts: 2995
Joined: 01 Mar 2017 17:21

Re: help needed for a glued headshell

Post by Spinner45 » 30 May 2018 21:16

Attempting to dislodge the headshell now will likely destroy it.
I'm sure the threads are permanently LOCKED with that epoxy.

Massimiliano
member
member
Posts: 42
Joined: 17 May 2010 21:01
Location: near Venice

Re: help needed for a glued headshell

Post by Massimiliano » 30 May 2018 21:19

That's my fear, too.
I'm afraid i must remove the glued parts with a Dremel, then reconstruct the assembly with a standard arm socket and some plastic or aluminium (the shell's back).
I'm hardly enthusiastic about this solution, but dealing with the darn epoxy is a brutal business.

Alec124c41
vinyl engineer
vinyl engineer
Canada
Posts: 23480
Joined: 28 Oct 2002 03:24
Location: North of Toronto, Canada

Re: help needed for a glued headshell

Post by Alec124c41 » 30 May 2018 22:53

That looks like nail polish. Try some nail polish remover, or acetone.

Cheers,
Alec

Massimiliano
member
member
Posts: 42
Joined: 17 May 2010 21:01
Location: near Venice

Re: help needed for a glued headshell

Post by Massimiliano » 30 May 2018 22:58

Alec, if you're right... :shock: :oops: :lol: :lol: :lol:

Gelid
broken record
Posts: 521
Joined: 07 Dec 2014 05:56

Re: help needed for a glued headshell

Post by Gelid » 30 May 2018 23:03

That looks like Loctite 262. Permenant thread sealant.

You may have luck heating the threaded joint, very carefully, with a small butane torch.

** Before you try this, take account of any plastic parts in the vicinity of the joint.
You don't want to melt anything. If the collar, arm, and headshell are all some type of metal, then I'd put some heat to it.

You could also look for a spare tonearm on a European Ebay site.

Massimiliano
member
member
Posts: 42
Joined: 17 May 2010 21:01
Location: near Venice

Re: help needed for a glued headshell

Post by Massimiliano » 30 May 2018 23:12

Gelid wrote:That looks like Loctite 262. Permenant thread sealant.

You may have luck heating the threaded joint, very carefully, with a small butane torch.

** Before you try this, take account of any plastic parts in the vicinity of the joint.
You don't want to melt anything. If the collar, arm, and headshell are all some type of metal, then I'd put some heat to it.
Unfortunately, the old threaded socket is made of plastic, and also the back of the headshell. There's a complete lack of spare parts for these old Lesa.

62vauxhall
senior member
senior member
Posts: 722
Joined: 22 May 2008 19:57
Location: Surrey, BC

Re: help needed for a glued headshell

Post by 62vauxhall » 30 May 2018 23:16

I was going to say Loctite as well and would also try heat as a way to soften it. But not a butane torch or any flame for that matter. It may discolour the metal like what happens to some motorcycle exhaust pipes - they turn blue.

A heat gun would be my choice but as was mentioned, take care around any plastics.

Nice looking table by the way. Would be nice te see one in the flesh one day.

EDIT: You should check Loctite's website or Google search "how to remove Loctite". There must be a solvent that will affect it.

Massimiliano
member
member
Posts: 42
Joined: 17 May 2010 21:01
Location: near Venice

Re: help needed for a glued headshell

Post by Massimiliano » 30 May 2018 23:22

62vauxhall wrote:I was going to say Loctite as well and would also try heat as a way to soften it. But not a butane torch or any flame for that matter. It may discolour the metal like what happens to some motorcycle exhaust pipes - they turn blue.

A heat gun would be my choice but as was mentioned, take care around any plastics.

Nice looking table by the way. Would be nice te see one in the flesh one day.

EDIT: You should check Loctite's website or Google search "how to remove Loctite". There must be a solvent that will affect it.
Thank you very much.

Massimiliano
member
member
Posts: 42
Joined: 17 May 2010 21:01
Location: near Venice

Re: help needed for a glued headshell

Post by Massimiliano » 30 May 2018 23:49

To sum up: red Loctite is permanent stuff, and removing it without the application of substantial heat may be nearly impossible.

euclid
senior member
senior member
United States of America
Posts: 421
Joined: 28 Sep 2002 15:17
Location: Silver Spring, MD, USA

Re: help needed for a glued headshell

Post by euclid » 31 May 2018 00:38

On this side of the pond there is (maybe was) a red insulating varnish that was sold by GC (General Cement) that was often called Glyptal. The original solvents may have been xylene and similar products. It was also commonly used to "seal" the shaft of pots, the screws on IF Transformers, and other adjustments. In this use it acted a a mild glue and also gave an indication that the adjustment had been changed.

I was always able to "break the shaft free" with a little work. It may also soften or dissolve if acetone or a hydrocarbon solvent is applied. These solvents are often liver toxins and flamable. Be careful and minimize your exposure to them. Working outdoors on a nice day is a good idea.

Sunwire
long player
long player
United States of America
Posts: 2219
Joined: 07 Oct 2004 21:54
Location: New York

Re: help needed for a glued headshell

Post by Sunwire » 31 May 2018 01:08

I would try acetone (nail polish remover) first.
Then 90% isopropyl alcohol.

Acetone toxicity
From wikipedia:
"Acetone has been studied extensively and is generally recognized to have low acute and chronic toxicity if ingested and/or inhaled.[42] Acetone is not currently regarded as a carcinogen, a mutagenic chemical nor a concern for chronic neurotoxicity effects.[41]

Acetone can be found as an ingredient in a variety of consumer products ranging from cosmetics to processed and unprocessed foods. Acetone has been rated as a generally recognized as safe (GRAS) substance when present in beverages, baked foods, desserts, and preserves at concentrations ranging from 5 to 8 mg/L.[42]"

Massimiliano
member
member
Posts: 42
Joined: 17 May 2010 21:01
Location: near Venice

Re: help needed for a glued headshell

Post by Massimiliano » 31 May 2018 01:33

Thank you, euclid and Sunwire. I will try everything, outdoors.

Copperhead
long player
long player
Posts: 1933
Joined: 07 Mar 2015 00:47

Re: help needed for a glued headshell

Post by Copperhead » 31 May 2018 02:09

Massimiliano wrote:Thank you, euclid and Sunwire. I will try everything, outdoors.
Take a bit of the red stuff off the tube, then you can experiment on it away from the arm. A sharp knife should do.

If you are lucky it might be nail varnish and acetone will dissolve it. It does look like Loctite red lock, though, then you are unlucky.

AsOriginallyRecorded
long player
long player
Canada
Posts: 1031
Joined: 26 Jun 2018 06:05

Re: help needed for a glued headshell

Post by AsOriginallyRecorded » 31 May 2018 04:19

Although I would be very leery about using heat of any sort because of the internal wiring, I might consider super cooling with either canned air or even liquid nitrogen to possibly force shrinkage and contraction of the sealing contact surface. Not sure if it would work, but preferable to the application of heat sufficient to do anything. My first choice would follow Alec's advice to be truthful. I can't really imagine anyone using Loctite in such a manner, so hopefully, that is not the case here. Such a nice looking turntable, but such an amateurish application of the sealant doesn't quite add up somehow. Let's hope this is an easy solution case. Cheers and good luck! [-X

Post Reply