Charlie,
Bet your opening lever does not stay over? That pin (plunger), with the small spring, and barrel latch trip is what releases your opening lever from the open position when the barrel lug presses down on the parts. Do you have the other two parts in there? Or do you have extra parts?
Go to the Parker Home Page, Technical Information, parts illustration. Part 20 is three pieces but you can't tell it from the illustration.
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