Worst case I'll just remove the gearbox and take it down to the exhaust guy (who I'm sure has lots of welders...)

Whilst it's in the car it's a bit trickier to go medievil on it's arse...

I'll concerntrate on getting the car wired up and started in the next week - and if everyone shoots down my fill the gearbox from the tailshaft interface....well then I'll have to drop the box.