When the hinge pin was removed by Parker to slip on a new guide roll, the frame was supported and the pin pressed out. Not supporting the frame fully can lead to a bent or fractured frame. You'll see a screw head but taking that out only exposes the remaining hinge section. The hinge pin does not engage the hook hinge, its the guide roll that is the engaging surface. Most of these old pins are rusted or in so tight that the frame can be damaged by removal; that's why adding metal to the hook hinge section is the favored approach.
Because the hinge pin is not exposed between the frame arms, its the guide roll that has been damaged and you'll need a new one or to re machine the old one. The old pin can be reinserted.
I have a soft spot for C grade small bores. Barrels fluid, crolle damascus or Bernard?
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Threaded Mode