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One thing I can suggest..do not use a cable system..I have tried and tried but nothing works in a satisfactory manner..it works but only just.... I am about to change over to a system that relies on bike chain...cable runs into the problem of a varying diameter due to more or less cable...anyways just trust me avoid cable.
Also I would suggest you think about remote control...there is no price to high that I would not pay to be able to press a button at 4 am and close up rather than going out to do that job...also I am sure if opening and closing was not such a pain at the moment I would probably open up at times where now I won't because I worry about clouds and having to close up...certainly my age and health exacerbate the matter but these days it is not a big deal to go remote and planning for it really is the smart thing to do...
My last observatory was my fifth but they have all been a roll off approach so I can not comment upon the virtues of a dome.
The garage roller door seems the way to go and I would assume that as garage doors use remote transferring the concept to your observatory should not be difficult.
Alex
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