Mmmm...failed this afternoon!!!

Please help - I want to service and lube my Challenger, but have the following situation that have failed me miserably:

Stock and barrel removed leaving the cylinder and trigger block.
Scribed across cylinder to trigger block marking original alignment.
Clamped breech jaws in soft jaw vice (in direction of pivot!).
With a solid, good fitting bar inserted into the trigger block hole, tried to unscrew it. Bloody tight, but, I thought yippee, it is starting to turn, but, the scribe marks are still in line. What the, who the, what the hell is going on?
The cylinder had started to turn around the breech jaws section!!!!
Turned it back into place.
Repeated same again after using a gas torch to heat up the cylinder near the trigger block to expand cylinder and soften any Loctite should it have been applied in its passed history.
Still no go, even with some sharp blows to the bar inserted in the trigger block.

Please;
How is the breech jaw section fitted to the cylinder tube? Is it brazed in? Pressed in? What to do now it had started to turn? Will it be safe?
How the hell can I unscrew the trigger block from the cylinder? I presume a right hand thread?
Talk about a Friday afternoon job...this is a Sunday afternoon job I wish I had not started.....
Any advice welcome!

All the best to all.