Hi Michael Baldwin has a technical bulletin describing such a repair. There are over sized agraffes which would allow you to tap the hole to a larger size and install the oversized agraffe. Only the threaded portion is oversized. Another option is to drill and tap the hole from the bottom, but not all the way through. Then install a special bolt with a hole drilled through its length. When the bolt bottoms out in the hole it is broken off flush. The threads for the original agraffe are then tapped in the pre-drilled hole in the bolt. This repair is used by Baldwin and O. S. Kelly, and is described in more detail in the technical bulletin available from Baldwin Technical Support at 501-483-6116. Good Luck, Frank Emerson Baldwin R & D
This PTG archive page provided courtesy of Moy Piano Service, LLC