Make the aft plug screw-on #20
Description
Currently, the assembly is complicated, and water-tightness of the aft plug can be compromised by the plug not being mounted correctly (or the duct tape giving up :P ). This could all be fixed by changing the plug to a screw-on version, something like the plug in this. This might require an interior overhaul, however, if we cannot get a plug that screws into the end of the pipe instead of in the side.