Mark, my advice to you is to save yourself alot of grief and pass on this one. It seems that problems are waiting to happen on this piano. If you MUST replace another agraffe, you can inexpensively size the height of the strings by using a small rectangular piece of wood (say 1x1x4, so you can hold it in your hand while you work) drill a hole in the side near one end, just large enough for the agraffe shank to fit, lay a small fine file alongside the hole, insert the agraffe into the hole so that the shoulder of the agraffe lays (lies?) on the file and rotate the agraffe with whatever tool you have to turn the agraffe into the plate (You can make one), until you duplicate the proper height of the string. You are removing material from the underside of the agraffe shoulder. 4-10 complete rotations should do it, go slowly and repeatedly check against the old agraffe. Be careful not to run the threads against the file. You can also buy a milling tool to do this but it is not necessary and leaves a rougher surface than the file
This PTG archive page provided courtesy of Moy Piano Service, LLC