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-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of
Richard Solomon
Sent: Tuesday, April 16, 2019 10:52 AM
Subject: Re: [TekScopes] Absurdly simple way to get contact cleaner
into some Tek pots

My foolproof method is to drill
a small hole on the top side at
the rear. Pump in De-Oxit Fader
Lube and seal the hole with some
black tape.

73, Dick, W1KSZ

On Tue, Apr 16, 2019 at 10:45 AM Terry Gray via Groups.Io <tlgray42=
[email protected]> wrote:

I also have restored 100's of "sealed"? noisy controls by

pointing

the control shaft straight up vertically, wrapping something around
the bottom of the control to catch the excess contact CLEANER/LUBE,
spray around the base of the shaft where it goes into the control,

and

"pump" the shaft up and down and give it time to "pump" the contact
cleaner/lube down into the control---remember patience is a virtue.
If at first it doesn't seem to be getting the spray down the shaft,
make a dam" just below the point where the shaft enters into the
control and try spraying a little additional cleaner/lube into that
area keeping it saturated and at the same time periodically "pumping'
the shaft up and down to allow the cleaner/lube to migrate along with
capillary action down the shaft. Allow the potentiometer shaft to
remain pointed up vertically. Sometimes it can take overnight or
longer to get the cleaner/lube down into the control but I have found
over the last 50-60 years that it very, very rarely fails. Just be
patient and I think this will work for you, even for the difficult
ones. I remember setting upright on their backs some of the big
monster stereos and doing just that, especially when the

potentiometer access was not readily accessible even with the long
extended flexible tubing that sometimes came

with the contact cleaner/lube or that were also available at the

time. I

also remember running into some well sealed potentiometers and TV
tuners that we had to drill a small access hole into/through the

metal

or plastic housing to get the cleaner/lube inside to do its job. Just
be very careful to not drill into the tuner or control doing any
internal damage. I remember disassembling throw-away pots and tuners
to learn where to drill the holes to prevent any internal damage and

you could then seal the hole

up with solder or glue when you completed the cleaning/lube process.

One

additional point, DO NOT use a contact cleaner with no lubricating
agent in its ingredients. Many years ago I attended a Channel Master
seminar on their contact cleaners and tuner (and switch)
cleaner/lubes. The company representative showed us under a fairly
high-powered microscope a video of what happens when you spray a
contact cleaner (with no lube) on the old TV tuner switch contacts
You completely wash away all lubrication from the individual contact
points and he showed us under the microscope what happens when you
rotate the switch thru the washed contacts. It scrapes the plating

off

the contacts and now being unplated in that area it is oxidizes and
you end up with intermittent high resistance contacts down the
line(with time) that play havoc with your circuit. You think that you
are "fixing" the intermittent switch contact(s) (or the intermittent
internal potentiometer wiper problem) but in reality you are totally

ruining (for the future) whatever you are so-called restoring by using
a non-lubricated

spray. I wish the video that the Channel Master rep showed us was

still

available>>>>it looked like a chisel scraping the plating off the
available>>>>contact
under the high-magnification microscope when all the lubrication had
been previously "cleaned" off the contact areas. He said DO NOT EVER
use a contact cleaner that has no lubrication in it or at least

follow

up the "cleaning" process by spraying or adding some additional

lubrication to the

contact points. Hope this is helpful information to some of you, it

sure

was for me.
On Tuesday, April 16, 2019, 9:51:07 AM CDT, Bob Koller via
Groups.Io <testtech@...> wrote:

Try it sometime, I have literally done hundreds this way. Some last

week..