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On the mailing tube, mark a line corresponding to the toilet paper tube edge where the focus is best. In case the mailing tube is still too long to get a good focus, cut it again (though no more than one inch at a time, to avoid overshooting).

On the mailing tube, mark a line corresponding to the toilet paper tube edge where the focus is best. In case the mailing tube is still too long to get a good focus, cut it again (though no more than one inch at a time, to avoid overshooting).