How to fix loose barrel to frames ?

[BRDHNTR]

When it is apparent that the hinge on a Parker is sufficiently work down that the fit of the barrels to the frame is loose and there's a little 'wiggle' (don't now how else to describe it), what is the accepted method of repair. The hinge pins on Parkers are part of the monoblock construction, they don't punch out, they're part of the frame (I think I'm describing this correctly but if not, rest assured I'll be corrected). Is the correct repair to basically weld some metal to the hinge and/or the back end of the forearm metal bracket that marrie up to the hinge?

Is this a difficult repair and how costly? Ballpark?