Have you tried Giacomo? 315-336-1356 Give him a cal with regards to their warranty.
I send all of my rib repairs to him.
I've also work with him to help a few customers in the re-regulating of their Perazzi O/U's. Which involves removing the side ribs, changing the wedges, patterning, readjusting, then installing the side ribs and rebluing.
Dan is the service manager.