I am currently rebuilding a 1876 steinway upright. It has this really funky sustenuto system. Unfortunatly, I got the action completely disassembled so I haven't seen how the system works. There are two different rods, one that goes the full lenght of the action and the other that is the lenght of the damper section. I don't know how to attach pictures on this forum. The damper levers have a type of hook right underneath the damper closer to the player. Has anybody ever worked with one of these, have pictures or schematics? Thanks