I've managed to cross the threads on the threaded ring that holds the prechamber in (the injector screws into it - I screwed it in skew!:stupid: )

I don't need the prechamber tool itself, just the tool for pulling the 'threaded ring' as MB calls it. The engine is an angled injection, 1992 300D 2.5 Turbo engine 602.962.

Or, is it easier, and not insanely expensive to buy the tool?

Bueller?