Next time!
Jonny that sounds like an expensive repair to replace the gear etc, I think I'm best off using the box for spares?
Nah, it's all done now. It was dark and cold, and I only had a 3/4" rachet which wasn't up for the job. Went back the next day with a strong bar, and job done.
I've given Rumels gearbox in for a rebuild today. Thought I may as well get the syncros done whilst giving it away to fit the Quaiffe LSD.