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There is a gap between the glass and the secondary cell. That's just the way it is. It allows for contraction and expansion when the corrector changes temperature and you can also have some room to center your secondary. There should be two rubber washers back and front as well so you can't pinch the glass when you screw it tight. It's by design. No firing squad needed. All you have to make sure really is that you kept the orientation of the secondary vis a vis corrector and primary and you'll be ok.
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