Archived posting to the Leica Users Group, 2000/12/11

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Subject: Re: [Leica] Lens socket thread lining
From: "A.H.SCHMIDT" <horsts@primus.com.au>
Date: Mon, 11 Dec 2000 23:23:50 +1100
References: <001901c062eb$66c81880$dcc80e18@wwck1.ri.home.com>

gbicket wrote:

> Hi LUG,
>
> Here's one I've never run into before...
>
> In removing my Telyt R 400mm f5.6 from the tripod today, I notice that there
> is [was] an inner thread liner of what looks like stainless steel in the
> tripod mounting socket, that has now come loose and remained upon the 1/4
> inch tripod screw.
>
> This got "sprung" a bit as I took it off the tripod, with some of the
> "thread" still engaged in the socket and some on the screw.  Not realizing
> they'd parted company, and now mishapen, this spring looking part won't
> return to the socket on the lens.  The resulting socket is now a larger size
> and no longer capable of mating with the tripod, so I have a problem when I
> want to shoot tripod mounted.
>
> Anyone have any idea, where I might find a "re-liner" for this socket so I
> can thread it, and hold it there with a small dab of Loc-Tite?
>
> Other solutions?
>
> Thanks, all.  Enjoy the light!
>
> Greg Bicket

  Greg, It looks like, what you lost, is a thread insert. here in Australia it
is sold under
the brand name RE-COIL. It may have the same name in the USA, but I'm not sure.
It is used to strengthen the thread in  for example aluminum alloy parts. Its
also often used for threads in alloy motors, especially in racing cars. It looks
a bit like a spring, but it isn't.  The thread in the receptacle is made
slightly larger than needed, then this coil is screwed in to it. It fits
normally very tight. A special tool is used to screw it in, and also to break
off a small end of it. It should be available from companies who sell nuts and
bolts, and also from good quality tool shops. (Not the normal house and garden
sunday open shops)  The coils can be bought single, but you still need the
tool.  The bolt shop owner may be able to lend you one. If not, there is a kit
available which includes  about 10 coils, a tool and an oversize tap. The size
you need would be 1/4" whitworth or equivalent Should you have to much problems,
then I may be able to help you.

I'll buy one here, and send you an insert and the tool for a loan,  Find out
first if you can get it. there is also of course always Leitz, but I wonder if
it isn't to complicated for them.

Regards, Horst Schmidt

In reply to: Message from "gbicket" <gbicket@email.msn.com> ([Leica] Lens socket thread lining)