I have extractors that prevent that from happening. Somewhere.Time for the easy out with pieces of leather stuffed in between the flutes to maintain squareness and rigidity. If you got a full turn, you have some lube getting somewhere. Keep on with the concoction/witch's brew that worked.
That’s what I was afraid of when he said using a cheater was getting it to barely move. I figure the barrel threads are coming out with the choke tube.You said it was mostly duck loads, so steel shot yes? Sounds like the choke threads were "pounded" into the barrel threads and they tried to make both components "become one". Hope the barrel isn't toast.