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Hi Dave
The unit that I purchased direct from ZWO (amazingly quick and reliable delivery) arrived with heaps of debris which took me over half a dozen attempts (wet cleaning) to remove.
During the cleaning process, I noticed that red powder from the anodized threads was probably contributing to this.
I have 2 or 3 stubborn spots that will not budge, so I assume that they are on one of the surfaces underneath the glass protective cover.
The rate of debris settling has reduced so I only have to clean every 4 or 5 uses now, which is a little frustrating as the Tak mount is so good that I have to force it to dither to eliminate these spots in the stacking.
Cheers
Dennis
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