A portable design I am working on.
The 2 pipes are off the shelf steel. NB 80 medium wall for the main upright, OD 88.9mm, sleeve is NB 90 40S with OD 101.6mm and 5.74mm wall giving 0.61mm clearance.
Seat will swivel on end of mount and will be pinned up in transport. Locking collar to go in made out of the NB 90
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