37 Master Cylinder fitting and door handle lock question

I need the master cylinder fitting that screws thru the brass junction block , I can not get the one I have to seal on the flared end side and I have tried several different flares. Looking into the end it looks like
the inverted flare coming up from the fitting is not perfectly round.

Also a question. I am putting the door handle on and It looks like a wire wring of some short held the key lock in place. Does anyone have one apart that could tell me the size of the wire and the procedure to install the lock? The owner took this one apart, (or their plater) so I am having to guess about how to install it. I don't see any info in the maintenance manual.
Thanks !!