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From: Cursitor Doom <cd999666@notformail.com>
Newsgroups: sci.electronics.repair
Subject: Re: Switch Contacts
Date: Sun, 15 Sep 2024 23:44:45 -0000 (UTC)
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On 15 Sep 2024 21:03:04 GMT, Roger Hayter wrote:

> On 15 Sep 2024 at 21:44:07 BST, "Liz Tuddenham" <Liz Tuddenham> wrote:
> 
>> Nick Hayward <nhayward8990@protonmail.com> wrote:
>> 
>>> Hi all,
>>> 
>>> I have a switch which isn't making electrical contact. It consists of
>>> two leaf springs. Dead simple. They're springy enough to push against
>>> each other alright. And I've cleaned them with ethanol (didn't work)
>>> isopropyl alcohol (didn't work) and Servisol switch cleaning lubricant
>>> (didn't work either). I am at a complete loss here. Has anyone come
>>> across something like this? I can confidently say I never have!
>> 
>> I have had this happen when Hypoy gear oil has got on the contacts, but
>> as other have said, the fault may be elsewhere.  Were you making your
>> measurements directly on the springs or on something attached to them?
> 
> A possibly short term solution is to rub very fine folded over emery
> paper between the contacts. It tends to destroy plated contacts but
> might just get the switch working.

Which is what I plan to do next, in fact. I have some 3000 grit paper 
which should be close to perfect for this kind of thing. In fact I have a 
full range from 3000 right through to 40. I'm hoping it won't require 
anything below 1200, though!