Bill; It has been my experience that goo and oxidized oil and grease under the extractor/ejector causes a forward pressure on the roll. It is this forward pressure that keeps the cocking hook from disconnecting, not the cocking hook itself. I may be wrong, but cleaning the extractor/ejector mechanism has worked for me.
You are exactly right in tripping the Parker poker to release the hammers to fire in a gun stuck in open position.
Best, Austin
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