hahahhaah  I always love those jobs that must be preceded by a speech "this may very well destroy...no guarantee it will work...will try to...(my favorite) lots of hours and may fail I got to have a deposit".  Thing is when you pull it off those always feel really good.   I remember long ago when I was being taught to do cast iron...had a steam pressing machine (dry cleaner) that was vintage and very well built.  Had a 1 ft long crack in a three inch thick piece on one of the arms...lets go with this fancy nickel rod the salesman dropped off....full bevel, constant preheat....halfway through we broke for lunch leaving a rosebud pulled back on the joint...come back from lunch to see a 2 lb or so of nickel neatly split off one side. 4 hrs labor, lot of acet/oxy and 2 lb of rod gone.  Ok broke out the little square iron rods and flux and I got a lesson in how to apply it..

I was lucky enough to dodge this job...
Co-worker a few tables over got it.
Random customer came in with a little tea pot like thing, kinda old and fancy, seemed to be made out of silver.
The handle had fallen off, so the co-worker went to silver braze it back on.... had the oxy-act out and was heating it up oh so gently...
I happened to be walking past his table while he was heating it... the second I turned past the curtains I heard *TINK tink tink...*. I stopped, thought "That didnt sound right..."  and walked back around the weld screen.
The whole thing fell apart. All of the soldered on pieces fell off.
He was sitting at his bench, silver braze rod in his hand, torch still lit shaking his head and looking like someone kicked his puppy. The 30 min quickie turned into a 2 day jigsaw of how the hell does it go back together...