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A simple solution I reckon. Cut it neatly, and (assuming it is a metal tube) get a ring attached to the inside of one of the sections. This then allows the other section to "slip over and not" this ring. Then use those "over-centre" latches, Bunnings here have them. About 4 around the tube would be sufficient.
And no, the "thickness" of the cut should not affect the focus etc at all. Make sure the cut is neat, straight, and tidy though.
Gary
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