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Thanks for that. What is PWM?
I am not sure what you mean by a "cuff". A circular tube sticking out past the end of something?
Yes the air is pulled out and it appears to be sealed as you say. I think the AP Riccardi Honders is doing the same thing.
I think air flow does indeed inhibit dew as well as heat. Having all of these various items - dew shield, flocking, air flow, heating if needed (as a last resort I imagine) thermal blankets add up to dew is not too much of an issue unless you are in Cairns or Florida.
Does regular dewing stain the mirrors?
Greg.
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