John,
Thanks for the diagrams. They are helpful. Seems to me that the "trip" pin we are talking about is part #20 which is depressed by the cam on the barrel when it closes. The bottom of #20 must slide down into a recess when it is hit from above, allowing the top lever to swing back to center. It may be that debris has gotten under #20 preventing it from depressing fully. I am just arm waving here, and I don't really know what the part numbers in question are or what happens. Tomorrow, I will make a tool to slide under that tab to possibly clear any debris. Barring success with that, next stop is a gunsmith.
Brad
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