Take the grips off. Dry fire it. Look up into the action and you will see a little piece of metal (don't remember what it is)either hanging down or jammed down on a cross pin. You don't want it stuck on top of this pin. Pull the trigger and turn it upside down and shake it, point it up while it's still upside down then turn it rightside up and the little piece of metal should be hanging down like it's supposed to do. now the mainspring should pull out just fine. Reassemble in the same condition.
"Suppose you were an idiot, and suppose you were a member of Congress, but I repeat myself." Mark Twain