I'd be extremely careful trying to remove the moveable head unit on the L1200. It is attached to an extremely strong metal spring, that could harm you if you're not careful. I got my finger almost crushed when that head unit unexpectedly shot to the top when handling it...
If I were you: Move the head to the top to release tension on the spring, and deal with the fact you got yourself a beast! It will be worth the effort once it is back up and running, as you already know from using it.