The first photo might look slightly more dramatic than it is, here area two more:

So I tried to remove the gas compression spring of my new office chair from the sockets to send it back. It’s firmly stuck in both ends, and I read the recommendation to knock it with a rubber hammer. I couldn’t find one, so I covered the gas spring with some soft cloths and tried a regular hammer - and was a bit too enthusiastic. Is this spring still safe to use? I’m guessing/hoping that that’s not really the outer wall of the gas cartridge? It is still working, extends and compresses smoothly.