Re: Mach2GTO counterweight shaft stuck midway #Mach2GTO

Bill Long

Agree with Chris here. 

Spit is probably better than WD40. 

From: <> on behalf of Christopher Erickson <christopher.k.erickson@...>
Sent: Tuesday, August 9, 2022 2:42 AM
To: <>
Subject: Re: [ap-gto] Mach2GTO counterweight shaft stuck midway
NEVER use WD-40 on ANY part of a telescope or mount. It is a PENETRANT, NOT a lubricant. It penetrates into everything. It dissolves and ruins real lubricants, it can ruin optical coatings, it can ruin circuit boards, and it can actually accelerate corrosion.

A drop of LUBRICANT in counterweight shaft threads is good. Cleaning dirty, contaminated threads with a toothbrush is good. And doing both is even more goodness. LOL. 

Using a [slightly oily] rag to clean shaft threads before assembly might do the trick as well. Place rag around threads, grab rag and threads and then "unscrew" the threads from the rag and your hand.

If your threads are really dirty with something that is really stuck to them, a metal brush and some Break-Free CLP might be required. Followed by the old "unscrew from an oily rag" trick. (Nod to Don Adams.)

Currently my favorite lubricant is Break-Free CLP (the older brown formula over the newer blue formula) but there are lots of good lubes out there for various applications. 

-Christopher Erickson
Observatory engineer
Waikoloa, HI 96738

On Mon, Aug 8, 2022, 11:18 AM Brian Valente <bvalente@...> wrote:
>>> And the only precaution I have ever taken was
to apply a thin coat of WD40 to the counterweight bar threads

I agree with adding something to threads, but I prefer CLP. I may have lifted that from Christopher?

On Mon, Aug 8, 2022 at 2:17 PM Brian Kaine <briankaine@...> wrote:
Hi Carl,

Sorry to hear about the problem, but I am sure that Astro-Physics will have a
solution for you. Their support is the best in the world!

Regarding this as being an issue with an older batch of mounts, I can only add
that I own the first production sample, #M20011. I have never encountered this
problem, so it is likely hit-or-miss. And the only precaution I have ever taken was
to apply a thin coat of WD40 to the counterweight bar threads. An earlier AP900
mount that I own developed a nasty squeek when screwing in the bar (although
it had never siezed up). The oil put a stop to that problem.



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