Great video of the leak Brian
I still have an area of LHM on my driveway, it just won,t go away
I think I will have to clean it up with some carb cleaner
the photo,s are really informative too Brian, I can see the excellant work
that you have done already
the remainder of the HP pipe, from the area that is leaking is too short
to do anything with
If you find that the putting the unions in the vice, that they become
squashed, you could put a single hex socket ( not a multi-hex one ) on
say, a 1/2 drive T bar in the vice too.
slipping around in the vice too.
Anyway Brian, the very best of luck and I hope all goes well
Take Care.
Vince.