Summary

Here is a mount for holding 12l/AL80 scuba cylinders upright in situations like a boat.
AL40 stage cylinder added

Let me know how it goes for you and if it breaks where so I can try and improve it!

Instructions

bungee is fed through the two outer holes and knotted on both ends to form a loop.
the two inner holes are to allow it to be screwed in. they are roughly based on a 10G wood screw
(the holes in the picture are from v1 where I made them way too large)
I have made the inside semi reassessed to give it a little more strength and save on some plastic.

AL40 is done, set up for an M5ish screw, I have added a slot to allow for small positioning errors during install.

Scuba Cylinder Stay