LOTS of stress on that Ketland mainspring. If you don't have a mainspring vice, Get One. Keep the end of the vice up close to the toe of the spring as you can so it lifts at the toe on one side. Less chance of breaking the spring this way. Put the lock on half-cock, put the mainspring vice on & just snug it up, now pull back slightly on hammer & depress sear arm & then let the hammer all the way down. Now wiggle the vice & the mainspring should come out. If the mainspring is still caught under the bolster, go back to halfcock & take 1/4 turn on mainspring vice & try it again.
:thumbsup:
Keith Lisle