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Vintage Telephony and Telecomms Vintage Telephones, Telephony and Telecomms Equipment

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Old 3rd Mar 2006, 10:04 pm   #1
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Default Glue for telephone leads.

Hi all.
I have a telephone on which the handset cord sheath has pulled out of the grommet. What is the best glue to use to re-fix it please?
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Old 4th Mar 2006, 12:46 am   #2
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Default Re: Glue for telephone leads.

For many jobs including this one I use a liquid polystyrene cement which is essentially Halogenated Allphhatic Hydrocarbon. This is one of those cements that softens and 'welds' several types of plastic although it's intended use is with polystyrene as used by modellers. This is quite a potent liquid and any excess or spillage evaporates rapidly. Similarly, the 'glue' type poly cements in tubes will do the same job but can be messier.

The liquid cement I use is marketed by, among others, Slaters and has the brand name 'Mek-Pak'. In the telephone instance you would do the same as PS suggested with Superglue ie let the liquid run into the gap between cable and grommet. It will not harm the pvc insulation of the fine wires inside the handset cord, but then it shouldn't find its way to those in any case, providing you don't overdo things and allow the whole grommet to go soft and tacky. This Mek-Pak is also excellent for repairing cracks in the cases of 700 series telephones, as well as the (plastic) cases of many tranny radios.

Alternatively, I've found that orangey label remover stuff is also handy for such repair jobs as it too will melt certain plastics - which will harden again once the fluid has dried and the excess removed. The latter can be a problem though; it's oily and doesn't evaporate, so wiping off excess can cause damage so care needs to be taken here.

Incidentally, 700 series phones are not especially valuable (with one or two exceptions) but the 711 is the somewhat more sought after of the wall versions - especially in colours other than grey or ivory.
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Old 4th Mar 2006, 1:06 am   #3
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Default Re: Glue for telephone leads.

Another option is merely to use a small nylon cable tie instead of glue
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Old 5th Mar 2006, 7:46 pm   #4
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Default Re: Glue for telephone leads.

On the assumption that both the cable and the grommet are PVC, then the correct adhesive is vinyl cement sold under the brand names of either "Polycell Vinylweld" or "Loctite Vinyl Bond", and commonly used for repairing inflatable toys and paddling pools.

This is a clear adhesive which welds the parts together but remains flexible, whereas both superglue and polystyrene cement are brittle when cured and have poor flexing tolerance; the same is true of epoxy adhesives such as Araldite.

As an alternative to vinyl cement, you could use a one part polyurethane adhesive, not perfect since it is generally yellow/brown in colour, but it does have good adhesion and retains some flexibility when cured.
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