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[If you cut and/or machine the end of the tube square and it's the correct diameter to fit inside the lens cell, it should butt up against the back of the inner ring that the lens itself sits against on the other side, therefore being reasonably square to the optical axis. Then, as Merlin said, you can use an laser colimator to fine tune the alignment of the lens cell and the focuser.
Jeff
QUOTE=Poita;811164]How do you go about mounting the lens so that it is perfectly 'square' to the tube?[/QUOTE]
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