Ex military 110 door handle

I'm trying to find one of these door handles for my '86 ex military 110. JP Richards do one that's similar, but on mine the lock is directly above the handle pivot, not offset like theirs and others I've seen on eBay etc.
I rebuilt mine a few times, but now the pin that flips the lock has broken off and there's not enough metal to drill it and fit a new pin.
Does anyone know the best place to look?

Try googling P.A Blanchards / they usually have a good stock of ex-mil spare as do drop zone surplus in pulborough