Yep, part 20, actually three parts: trip/spring/pin. Held in place from below by part 13, cocking slide. The pin facing downward with pressure from the spring slides into the little indentation in the cocking slide upon opening. The top part of 20 (trip) by the little spring's pressure slides into the half-moon notch cut into the bottom of part 15, "Square top bolt." Without the cocking slide in there it would not work at all.
Of all the parts on a Parker that are a universal size and almost always need replacing, I wish someone made a repro of these three parts by the thousands. Most every gun could use new part 20. While we are wishing, would also love new roll pin screws (18), especially the heads. The other end of the screw can be reworked but the heads are time consuming and difficult to fix.
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Threaded Mode