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Alistair,
The 1 trunnion gives stiction and the ball bearing is almost frictionless.
The bungee is a virtual counterweight.
I made the fiberglass tube by 1) getting 50mm aluminium tube.
2) wrapping it in kitchen greaseproof paper
3) winding fiberglass on and applying resin
4) when dry, pull out tube and g/p paper
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