. The problem is that no spare parts are available. Pfaff stopped making the machine in (I think) 1980.
Spare parts are available some time on EBay. The machine casing is all metal, yet the most vulnerable part is the cam stack made of plastic and is known to crack. . What makes the machine so desired is the IDT . (Dual feed.) There are other makes that have this capability.. I have been hunting for the plastic tray for ages with no success