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Most OTA's have lots of holes in them to hold mirror's, focusers, etc. When you unscrew somethig you can remove the paint from the hole in which rust can form. It pays to check the holes to see if the paint has been damaged. If so, clean it with a bit of metho then paint it with some clear nail plolish. Soften some candle wax and coat the screws threads before using them. Every bit helps.
Cheers!
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