I just posted a problem with the gas lift in my office chair and happened to see your post. It appears in my case, that gas lift is never coming out of its sockets again, I have tried a number of different ways. It’s so precisely fitted into these openings, it’s not moving the slightest fraction of a mm. So if you decide to replace those gas lifts, before ordering I highly recommend you first try a couple to see if you’re able to remove them at all - it might simply not work, and you could be stuck with these like I am