Hi, If this is the bench I think it is there are two blocks of wood near the ends of the central shaft that have two hex bolts holding them to the under platform. There are *also* long nails through the blocks which need to be extracted. The blocks can then be firmly pushed togather and the bolts tightened. I have also taken steel plates a drilled them for the bolts which allows more secure tightening. If this is the type that has a small central metal retainer with four screws to maintain level the screws work loose and need to be tightened until they strip out and new, larger screws installed. At some point hardwood plugs need to be installed to hold the retainer properly. Hope this helps. If not mail me. Newton
This PTG archive page provided courtesy of Moy Piano Service, LLC