Adding a swivel base to an armchair

[spuorgelgoog]

You can get "captain's chair" mechanisms/bases which would give you tilt and swivel.

Take the casters off if you don't want it to move.

Nautical places have a variety of thingies for seats (this is a US site)

(UK site)

Owain

[mark.bluemel]

Which you have preserved in pristine condition?

[Bert Coules]

Owain, thanks for that. The chair base is too deep for my purposes, but the idea to look at nautical supplies is a very good one.