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IIRC some flexible couplers in the 576 have the be insulating up to the
full voltage output of the 576.

I know that because I needed to replace one and luckily Hakan Hintze had
one on stock.

David

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of
Dennis Tillman W7PF
Sent: 18 April 2019 03:41
To: [email protected]
Subject: Re: [TekScopes] 576 shaft repair

Hi Neil,
I had a slightly different problem but I think this might work for you.
But first, companies like McMaster-Carr () sell
flexible couplers that can be substituted for the broken ones you have. If
they don't have one that will work for you try what I did next:

What I have done in the past is taken a piece of heat shrink tubing that
is a close fit before shrinking. It should be long enough so about a half
inch of heat shrink is on the shaft on each side of where the coupler used
to be. I put a dab of epoxy all the way around each end of heat shrink and
then insert the heat shrink onto the two shafts. With a heat gun I shrink
the tubing. When the epoxy dries it is glued to each end of the shaft. The
small section of heat shrink tubing in the middle where the coupler used to
be should be nice and flexible and act like the coupler did.

Dennis Tillman W7PF

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of
groups@...
Sent: Wednesday, April 17, 2019 8:32 AM
Subject: [TekScopes] 576 shaft repair

Apologies if this has come up before! I have a 576, and the plastic
couplers for the Intensity and Focus knobs are, of course, broken. They
look fairly hard to find, so I'm wondering what the best option is -
has anyone 3D printed replacements, for example? There's also a video
where a 577 has a similar repair accomplished with plastic tubing
().

One other thing - I've seen CRC 5-56 mentioned as the recommendation
for cleaning switches, but it no longer seems to be available - instead
replaced by CRC 05005. Is that an acceptable substitute, or should I
use something else?

Thanks,

Neil

--
Dennis Tillman W7PF
TekScopes Moderator