That Sinclair looks about right. Do you know if it swivels?
I fear plastic (and upholstery)- mine will be left out in the elements.
The drum thrones also look interesting.
Thanks for turning me on to new options.
That stool sold by Sinclair is perfect. I have two. They swivel and the little paddle you see under the seat is the release so you can adjust it. It is pneumatic and works like a charm.