Compression tester extension is stuck in spark plug socket.

I have tried getting the extension out with needle nose pliers, Screw drivers, the ratchet socket won't go around the
extension because there isn't enough space. I screwed a spark plug into the extension thinking it would screw out with
the extension but i think i tightened it more. I have been having alot of grief over this. No one seems to know what to
do. I am thinking about suing the company that makes the extension for not putting a disclaimer saying not to use the
extension with Subaru engines. The car is still running just on 3 cylinders. Anyone have any ideas?