Good Morning Russ - That is one long pin and is the axle for the hammers. Between the hammers the pin passes through a boss (part of the frame) that serves to keep it all tight and in alignment. The pin should fit tightly in that boss to prevent it from working loose. A new pin cut to a slightly closer tolerance or slightly deform the current pin should cure the problem.
Oops... I see that Brian corrected me - Thanks Brian.
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"I'm a Setter man.
Not because I think they're better than the other breeds,
but because I'm a romantic - stuck on tradition - and to me, a Setter just "belongs" in the grouse picture."
George King, "That's Ruff", 2010 - a timeless classic.
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