Tom,
Try a brass shim on the hinge pin to tighten it up. I would do nothing more than remove the dent in the barrel. .020 constriction is just about perfect with lead for upland birds and non tox shot (NiceShot) shoots best out of less constriction than more. I have three 10 gauge Parkers. One Twist and the others Damascus and I shoot them all with RST and Sherman Bell' loads.
You have a wonderful shooter that's begging to go afield.
Kindest, Harry
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