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 Post subject: Meltrpoe III Seized compression ring
PostPosted: Wed Nov 11, 2020 2:51 pm 
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Victor Jr
Joined: Thu Oct 11, 2018 11:11 am
Posts: 43
Can anyone please suggest a method of undoing a seized brass compression on the Meltrope III.
I cannot free it. I have been very patient with the penetrating oil but still no joy.
I and am a bit hesitant to use a blow touch as I am unsure of the possible effects on the body.
Has anyone experienced this?


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 Post subject: Re: Meltrpoe III Seized compression ring
PostPosted: Wed Nov 11, 2020 2:55 pm 
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VTLA
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Joined: Thu Aug 19, 2010 9:36 am
Posts: 2790
Location: Delaware
Put it in the freezer overnight. Or use freeze spray sold at automotive stores for freeing seized screws.

Good luck!
Andreas


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 Post subject: Re: Meltrpoe III Seized compression ring
PostPosted: Wed Nov 11, 2020 3:09 pm 
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Victor Jr
Joined: Thu Oct 11, 2018 11:11 am
Posts: 43
Thank you I will try tonight.


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 Post subject: Re: Meltrpoe III Seized compression ring
PostPosted: Wed Nov 11, 2020 3:40 pm 
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Victor III
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Joined: Mon Jul 02, 2012 9:57 am
Posts: 764
Location: Hampshire, England.
Hopefully freezing might work but please be aware that it may not be successful. A positive outcome can be dependent upon the alloy contents of the Mazac or Pot Metal which can be notoriously difficult.

You may find this thread helpful :

viewtopic.php?f=11&t=33157&hilit=Meltrope&start=30

Please let us know how you get on and good luck !


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 Post subject: Re: Meltrpoe III Seized compression ring
PostPosted: Wed Nov 11, 2020 4:26 pm 
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Victor I
Joined: Mon Nov 14, 2011 6:06 pm
Posts: 144
I would say that trying a "freeze" spray called "SHOCK & UNLOCK" sold in this country at motor car accessory shops may help. I have used it and found it helpful. The instructions, easy, should be followed as to how long the spray is aimed at the item.


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 Post subject: Re: Meltrpoe III Seized compression ring
PostPosted: Wed Nov 11, 2020 6:41 pm 
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Victor Monarch Special
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Needle Tins are Addictive
Joined: Fri Jul 09, 2010 8:32 pm
Posts: 5021
Location: Belmont, North Carolina
DEFINITELY DO NOT USE A BLOW TORCH!!! Pot metal parts melt at a low temperature and you will end up with a melted mess of lead colored slag... trust me on this, I know... :roll: :lol:
"The phonograph† is not of any commercial value."
Thomas Alva Edison - Comment to his assistant, Samuel Insull.

"No one needs a Victrola XX, a Perfected Graphophone Type G, or whatever you call those noisy things."
My Wife


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 Post subject: Re: Meltrpoe III Seized compression ring
PostPosted: Wed Nov 11, 2020 10:39 pm 
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Victor II
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Joined: Tue Jun 30, 2009 8:17 am
Posts: 461
Location: Victoria. Australia
Most Meltrope III soundboxes won't have this problem, but the later Meltrope III and especially the Meltrope IIIa are notorious for the poor quality of the pot-metal.

On these, I've never managed to undo the ring without breaking the housing for the rubber. I once even tried to cut off the ring but the two parts had fused together, they would just, not come apart.

My advice is to not remove the ring and use it as is. If the rubber really is petrified then cut and drill it out. Then use a strip of rubber 1mm thick or less and roll it into the housing.
Good luck.


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 Post subject: Re: Meltrpoe III Seized compression ring
PostPosted: Thu Nov 12, 2020 4:02 pm 
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Victor Jr
Joined: Thu Oct 11, 2018 11:11 am
Posts: 43
Well, I have tried 'the freeze' but with no success and judging by others experiences its going to be a case of 'use as is'
Its not obviously swollen or cracked as with other pot metal casualties that I have encountered.
Some of The later Decca models do not have a compression ring and from what I can remember they don't sound Bad at all.
Any comments?
Hopefully at some time in the future I will find a Good Body that I can use the excellent diaphragm and triangular needle mount with.


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 Post subject: Re: Meltrpoe III Seized compression ring
PostPosted: Fri Nov 13, 2020 4:36 am 
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Victor III
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Joined: Mon Jul 02, 2012 9:57 am
Posts: 764
Location: Hampshire, England.
flying500 wrote:
Some of The later Decca models do not have a compression ring and from what I can remember they don't sound Bad at all.

Some of the Astra soundboxes also had flexible rubber mountings and were designed without a compression ring although the main body was longer to give greater surface area. So long as the rubber is a good airtight fit on the tonearm there should be no problem and performance should be excellent. I would second Chunny's advice to dig out the hardened rubber and replace with as much compliant material as you can tucked in below the compression ring. You might be able to squeeze in a full rubber if very soft. I am not sure which model you have but it is worth remembering there are two sizes of holder and therefore rubbers---deep and shallow. Chunny may have these in stock ? Good luck.

They are also available here : https://www.ebay.co.uk/itm/MELTROPE-III ... Swztde5QQu

https://www.ebay.co.uk/itm/MELTROPE-III ... Sw7ple77Qq


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 Post subject: Re: Meltrpoe III Seized compression ring
PostPosted: Sun Nov 15, 2020 10:04 am 
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Victor Jr
Joined: Thu Oct 11, 2018 11:11 am
Posts: 43
Thank you All for your advice.
As you can see I have taken Chunnys advice and fabricated a working solution from two strips of 3mm rubber sheet.
I have tried it on a Decca 130, Dulcetto Senior and my Gramophone Co Junior Monarch and it sounds really Good on all of them.

Graham, thank you for the Meltrope thread in particular the Wild modification which looks like the method may also be useable on on Orchorsol soundbox?
I will also have to keep a watchout for the elusive Astra Box. A beautiful looking item.


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