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Well maybe the previous owner left the mount in the rain but I don’t think so, polar scope never used , and the RA had already been disassembled and regreased.
Interesting also that problems with noises really only surfaced in the very cold nights of late. Before that guiding 0.6. So I think Marc is right about performance being enhanced by covering the mount to stop the metal cooling to the point that things begin to bind ( in the post below)
.. Perhaps the advantage also of the old spring tensioned worm. Not perfect but robust.
I do maintain that any metal cased mount open to humid night air will generate condensation when not in operation. I can see condensation forming on the underside of a plastic bucket I use to cover the mount on a dry night and even in the open garage, just like the outside of a scope. Dew condenses on anything cooler than the dew point at that relative humidity which here is very high.
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