UK Vintage Radio Repair and Restoration Powered By Google Custom Search Vintage Radio Service Data

Go Back   UK Vintage Radio Repair and Restoration Discussion Forum > General Vintage Technology > Cabinet and Chassis Restoration and Refinishing

Notices

Cabinet and Chassis Restoration and Refinishing For help with cabinet or chassis restoration (non-electrical), please leave a message here.

Closed Thread
 
Thread Tools
Old 1st Jun 2018, 7:39 pm   #1
poppydog
Hexode
 
Join Date: Oct 2015
Location: Cornwall, UK.
Posts: 435
Default Correct Fastener ID

Can anybody please tell me the correct terminology for one of these? I need to find some as mine are rotten.

Right-hand thread machine screw with a left-hand thread wood screw. These are used to mount my speaker out of my Ekco radio.

Regards
Poppydog
Attached Thumbnails
Click image for larger version

Name:	20180601_171603.jpg
Views:	279
Size:	20.5 KB
ID:	163968  
poppydog is offline  
Old 1st Jun 2018, 8:35 pm   #2
emeritus
Nonode
 
Join Date: Jan 2012
Location: Brentwood, Essex, UK.
Posts: 2,784
Default Re: Correct Fastener ID

Not something I have come across. The closest is some types of decking screw that have a portion of left-hand thread adjacent the head, but the other end is ordinary have right hand woodscew thead.
You may find that the original screws will clean up nicely with a circular wire brush on a bench grinder or an electric drill such as a Dremel.
emeritus is offline  
Old 1st Jun 2018, 8:40 pm   #3
Cobaltblue
Nonode
 
Cobaltblue's Avatar
 
Join Date: Dec 2010
Location: Exeter and Poole, UK.
Posts: 2,897
Default Re: Correct Fastener ID

Something like these

https://www.tubesandmore.com/product...unting-studnut

Cheers Mike T
__________________
Don't care if it was a bargain why's it on my table?
Mike T BVWS member.
www.cossor.co.uk
Cobaltblue is offline  
Old 1st Jun 2018, 9:13 pm   #4
Radio Wrangler
Dekatron
 
Radio Wrangler's Avatar
 
Join Date: Mar 2012
Location: Fife, Scotland, UK.
Posts: 10,956
Default Re: Correct Fastener ID

Wilmslow audio supplied them when I built speakers.

David
__________________
Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done
Radio Wrangler is offline  
Old 1st Jun 2018, 9:16 pm   #5
dseymo1
Dekatron
 
Join Date: Dec 2007
Location: Shropshire, UK.
Posts: 3,053
Default Re: Correct Fastener ID

I must be missing something!
Unless you intend regularly removing and replacing the speaker, what advantage do they have over straight-through machine screws?
dseymo1 is offline  
Old 1st Jun 2018, 9:38 pm   #6
barrymagrec
Hexode
 
Join Date: Dec 2017
Location: Morden, Surrey, UK.
Posts: 372
Default Re: Correct Fastener ID

Something like this may be adaptable :

https://www.kjfaudio.com/product/hex...r-wood-type-e/
barrymagrec is online now  
Old 2nd Jun 2018, 12:14 pm   #7
Silicon
Heptode
 
Join Date: Jun 2007
Location: Coulsdon, London, UK.
Posts: 878
Default Re: Correct Fastener ID

If you can't find replacements, try leaving the rusty screws in phosphoric acid for an hour.

It will remove/loosen/convert the rust. You may need to use an old toothbrush or scourer to remove some deposits. The results can be impressive.

Some people use citric, oxalic and acetic acid.
Silicon is offline  
Old 3rd Jun 2018, 8:37 pm   #8
ColinTheAmpMan1
Heptode
 
ColinTheAmpMan1's Avatar
 
Join Date: Jan 2012
Location: Wimbledon, London, UK.
Posts: 785
Default Re: Correct Fastener ID

Citric acid is quite safe (lemon juice), as is acetic acid (vinegar).
Oxalic acid is very good at removing rust stains. But be careful with oxalic acid, it is poisonous. It is present in rhubarb leaves and, to some extent, rhubarb stems, too. It is the reason why rhubarb shouldn't be cooked in aluminium saucepans; it dissolves the aluminium, but it does leave the pan looking beautifully shiny!
Colin.
ColinTheAmpMan1 is offline  
Old 4th Jun 2018, 7:15 pm   #9
Chris55000
Heptode
 
Join Date: Aug 2007
Location: Walsall Wood, Aldridge, Walsall, UK.
Posts: 534
Default Re: Correct Fastener ID

Hi!

Quote:
I must be missing something!
Unless you intend regularly removing and replacing the speaker, what advantage do they have over straight-through machine screws?
Speed and ease of insertion!

The larger shoulder with the LH screw thread enables the screws to be driven in anticlockwise with a power tool until the head is flush with, or slightly sunk into, the surface of the baffle-board, they then have the advantage of staying in place whilst the LS drive unit is secured to the rear of the baffle with nuts and washers, something a conventional countersunk machine-screw doesn't have!

Unfortunately I haven't been able to identify a name for them either - self-retaining wood bolts perhaps?

Chris Williams
__________________
It's an enigma, that's what it is! This thing's not fixed because it doesn't want to be fixed!
Chris55000 is offline  
Old 4th Jun 2018, 9:24 pm   #10
poppydog
Hexode
 
Join Date: Oct 2015
Location: Cornwall, UK.
Posts: 435
Default Re: Correct Fastener ID

Thanks for all the replies and the links, unfortunately I can't seem to find the sizes I want. On mine the wood screw thread on a couple them has rotted and they have lost their "grip" so I have ended up having to carefully remove the speaker cloth to get them out. For now I have wound some very thin wire around the remaining woodscrew thread, put a small dollop of epoxy on them and wound them in as best I can, they seem to be holding. Not a class repair but what else can I do? As said in a previous thread, this isn't the greatest example of an Ekco radio.

Surprised nobody on here knows the correct terminology for them though??

Regards
Poppydog
poppydog is offline  
Old 5th Jun 2018, 9:36 am   #11
AC/HL
Moderator
 
AC/HL's Avatar
 
Join Date: Nov 2003
Location: Heckmondwike, West Yorkshire, UK.
Posts: 6,613
Default Re: Correct Fastener ID

They must have had a name once, but it would probably have been more cabinet maker trade oriented, so not so well known. Maybe as bland as "blind or single sided speaker mounting post" or some-such, or even just a pattern number.
__________________
Bill, BVWS member
AC/HL is offline  
Old 5th Jun 2018, 12:45 pm   #12
TonyDuell
Nonode
 
Join Date: Jun 2015
Location: Biggin Hill, London, UK.
Posts: 2,729
Default Re: Correct Fastener ID

RS used to do them about 30 years ago (not any more though) and called them 'Speaker Screws' (including the quotes) in the catalogue. So no proper name there either.
TonyDuell is online now  
Old 5th Jun 2018, 4:00 pm   #13
Bobdger
Pentode
 
Join Date: Jan 2015
Location: Rustington, West Sussex, UK.
Posts: 123
Default Re: Correct Fastener ID

All parts still have them Amp screws - speaker mounting screw (12) with wood and machine thread (lock nuts included)
Part number 2253409
Bob
__________________
Bob, BVWS member
Bobdger is offline  
Old 5th Jun 2018, 6:25 pm   #14
dseymo1
Dekatron
 
Join Date: Dec 2007
Location: Shropshire, UK.
Posts: 3,053
Default Re: Correct Fastener ID

Quote:
Originally Posted by Chris55000 View Post
Hi!

Quote:
I must be missing something!
Unless you intend regularly removing and replacing the speaker, what advantage do they have over straight-through machine screws?
Speed and ease of insertion!

<snip>

Chris Williams
I appreciate the advantages for production, but what I meant (and should have said) is why not replace them with ordinary machine screws? Authenticity, or something not quite so obvious?
dseymo1 is offline  
Old 5th Jun 2018, 11:38 pm   #15
1100 man
Heptode
 
1100 man's Avatar
 
Join Date: Apr 2016
Location: Ventnor, Isle of Wight, & Great Dunmow, Essex, UK.
Posts: 809
Default Re: Correct Fastener ID

Hi Poppydog,
I'm sure I've got a few of those in my miscellaneous screws box. I seem to remember they came from a record player I stripped down some 35 years ago!! You are welcome to them if I still have them. Unfortunately, I won't be near said screw box for another month if you can wait that long?

Cheers
Nick
1100 man is offline  
Old 6th Jun 2018, 8:51 am   #16
poppydog
Hexode
 
Join Date: Oct 2015
Location: Cornwall, UK.
Posts: 435
Default Re: Correct Fastener ID

Hello Nick, I ended up re-using the old ones (see post 10). Thanks for the offer though.
regards poppydog
poppydog is offline  
Closed Thread

Thread Tools



All times are GMT +1. The time now is 6:53 pm.


All information and advice on this forum is subject to the WARNING AND DISCLAIMER located at https://www.vintage-radio.net/rules.html.
Failure to heed this warning may result in death or serious injury to yourself and/or others.


Powered by vBulletin®
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Copyright ©2002 - 2018, Paul Stenning.