Hi So we are now in the same state as it was in the first place, yes? Unable to release the power when the click is removed from the ratchet wheel. The only path is to remove the balance and place a piece of rodico on the ratchet wheel to stop it moving place a piece of peg wood carefully into the gear train so as to jam the train. now with it all locked up remove the pallet/fork, now comes the trickey bit in releasing the train under braking condition so the power release is controlled or alternativly keep the ratchet wheel/barrel in the locked condition and remove the train bridge and wheels when done finally let down the mainspring under braking, again a controlled slow release of the power. Now hopefully the mainspring will be let down so that the barrel can be removed with its bridge so you can check for the problem as to why the barrel is jamming. Assemble just the barrel and its bridge and ratchet wheel and with a screwdriver on the ratchet wheel screw put one turn on the barrel and check for the freedom of rotation. I have used the above method/s when been in the same situation and managed not to break anything. The key word is slow and controlled release of the power.
I have a Hamilton 600 with a stuck caseback. Any advice on how to loosen it without damaging the lugs, or caseback itself?
It desperately needs a service, and an ultrasonic bath as you can see.