Gas lift chairs

Only with a *new* gas strut Doki.

Try the company that supplied the chair on the availability of spares.

BRG

No. I filled mine with wine jar corks, much better!

Ikea. I suspect they'll tell me to stick it up my arse and be grateful I got a chair at all and that it's lasted this long...

If you're not worried about being able to adjust the height, and simply want to stop it sinking below a certain level, you can put something round the extending strut to stop it being compressed. If you can remove the end fitting, you can slide a length of metal tube of a suitable diameter over it. Otherwise you could split a piece of tube lengthways and clamp the two halves round the shaft.

Replacing the whole thing could be pretty difficult, even if you can get a replacement. The bottom end has a taper which fits into a tapered hole in the spider which holds the wheels. In my experience, it's virtually impossible to separate the taper once the chair has been sat on for a while. I have used considerable violence on some of my chairs, to no avail!