![[Other] How does swiveling work in hairdresser chairs?](https://preview.redd.it/rkwjxg748w0h1.jpeg?auto=webp&s=54601afad1715de58e2fccdfd705646060c622d4)
[Other] How does swiveling work in hairdresser chairs?
Apologies if this question is not appropriate for the sub, I don't know where to post it.
I am planning to rebuild a vintage hairdresser chair to make a small, height-adjustable workbench/table for my hobby workshop. My plan is to replace the seat with a ca 2'x2' benchtop. But I have not worked with any of these chairs so I have a few questions:
How does swiveling work? Does the seat rotate on the piston or is the piston that rotates in the cylinder? Is the chair always free to swivel/rotate or can it be locked in one position? Does it differ between chairs?
Bonus question: do the hydraulics usually get worn out on older chairs or are they more likely to work "forever"?
The image is just an example. Ideas on brands or types of chairs to that would suitable or simple to rebuild are greatly appreciated.