Fuhr Replacement uPVC Gear Box Door Lock Centre Case 35mm Backset GenuineFuhr Replacement Door Lock Gearbox Centre Case A replacement centre case gearbox for the Fuhr multipoint door lock mechanism. If you're having problems with your door lock, the gearbox is almost always the problem and changing it is as simple as removing a few screws. Fuhr Door Lock Gearbox Centre Lock Case 35mm Single Spindle Information Important measurements: 35mm Backset 92mm PZ Centres This is the mechanism inside the door that is operated by the