I would suggest doughnut shaped rubber blocks and plates (washers) with a small diameter music wire running through to centre them and slide in a small diameter tube at the top of the leg and the thicker bottom of the leg made out with brass tubes (K&S do a range of incremental sizes) to run in a larger diameter ring at the bottom of the leg. That way you have two sliding positions with the springing between them.
(Of course you could do the same arrangement with conventional springs!)
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