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Looking at my UCA here, and I'm not exactly sure how you can rotate the spider vanes to make this work, unless you can rotate them yet keep the secondary mirror in the same orientation somehow. Otherwise if you rotate the spiders, you'll be rotating the secondary as well, which'll put everything out. Same goes for slightly shifting the position of the focuser mounting plate so the focuser clears the spider - you'd also have to slightly rotate the secondary mirror somehow, while not moving the spider, to keep the optics aligned. Or am I missing something simple?
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