Used Gibraltar Spindle Stool / Throne Base
Gibraltar throne base with a spindle for height adjustment. It works pretty well and is sturdy. There are dents in the tube from the bottom wingnut being overtightened so it's not a smooth action if your are putting it up and down so I would advice against this stool if you aren't just setting it up and leaving it. There's also a little internal damage but it doesn't appear to affect how will it works.