That pin is the axle dor the sears. The hammers axle on two separate locked screws.
Likely whoever restored your gun felt it necessary to polish up the pin, thus reducing it’s diameter some.
You could try some locktite on it and see if it helps. If not, a replacement pin will be the only option. Or drilling and tapping for a fox style pin lock screw. But that is excessive.
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B. Dudley
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