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Agree with everybody else on just sealing the perimeter with silicone, that's what I did, put in thin spacers to hold the glass above the tube, then run a bead around and inside the entire outer edge. Yes you will get a tiny amount of fuzziness due to the fact that now you have air between the outer glass and the tube instead of the old glue, but with the close spacing you should be using (same thickness of the old glue is what you want), it is unnoticeable really, even up close. Besides, even when new, that glue wasn't exactly the greatest material for a lens - and now you have eliminated it.
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