This one is made from an old D cell Mag-light.
The cut end was sealed with a JB-Weld stick about 3/16“ in from the edge (knurled end).
Then a layer of black silicone was applied on top of that finsihed flush to the edge.
The flashlight was a (3) - battery length light with plenty of tube length to cut off the switch and have enough left over.

Homemade Document Tube 1)