You probably found that the barrel hook does not directly engage a hinge pin; it engages a guide roll through which the hinge pin extends. This is shown in the diagrams in TPS and in Parker catalogs. Replacing the hinge pin does not fix looseness because it is not the bearing surface.
When Parker repaired loose guns, they had jigs that held the frame and prevented it from being bent while the hinge pin was pressed out. The guide roll was removed and a new one inserted in the frame channel, then the hinge pin re-inserted through the roll. Because so many hinge pins are extremely difficult to remove today, the preferred practice today is to weld new material on the barrel hook, then round file to shape, which takes skill and a fine hand.
As an expedient today, some will glue a shim into the barrel hook. This can last for years and costs almost nothing. My personal view is that this is not the best fix but something temporary. I realize that temporary goes on for years for some owners. I should further add that i have never personally done this work, but this is my understanding based upon reading and talking to gunsmiths who do this work as a matter of course. I have had one gun loose on face and fixed by the hook welding method, but I think by the time a gun gets loose on face due to guide roll/hook wear, there are many other wear issues with the gun.
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