Tim: your great gun is probably well past a good check and clean, and if the action is loose, it will only get worse with continued use. Here are some doublegun specialists near you:

Dewey Vicknair
Ephrata, Pennsylvania
vicknairrestorations@juno.com
(717) 626-4226

Hugh Williamson
Lancaster,OH
740-654-0944

Kenneth Meyers
New Oxford, Pennsylvania
717-624 8615

Rich Painter
Economy,PA
724-266-0232