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Unfortunately much astro gear is made from Aluminium/Stainless Aluminium/Aluminium which galls when screwed together tightly.
We used to see a lot of this in fighter aircraft and used specific copper synthetic greases, but, these would be not much use in an image train. Maybe a silicon anti-size grease but used sparingly. I use a zinc anti-size grease on car parts...the philosophy is the same. The anti-size ...in this case...has small spheres of the zinc which squish in-between the surfaces. Allowing a lower friction surface contact.
But as said...in astro gear a very small amount would suffice due to the fine threads.
This also worked a treat on my mount, G11 clutch knobs. Stainless and alloy, the zinc anti-size freed it up enormously. But hey that was a large thread....YMMV!
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