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Hi Clarry,
Have to agree with Geoff, I built a Denver chair and the concept is so simple, you just lift the front of the seat to go higher or lower and your weight on the seat locks it in position. It fold up flat for transport or storage and is self contained, no loose bits to lose or put together.
Also it has three contact points with the ground so is inherently very stable, regardless of the surface it is setup on.
Regards
Trevor
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