If you dont need it looking sexy, then something like a 40mm OD rod
coated with relese agent and a bit of fibreglass cloth wound over it
impegnated with resin is not hard
You can make moulds from all sorts of things. I wanted some insulating
disks so I used car body filler inside some plastic milk bottle tops.
isn't 40mm about what waste pipe is, too?
a section of that wound with clingfilm if necessary to increase the
diameter could work
You can get glass cloth and resin at Halfords
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