Paddock Lockmaster Twin Cam Deadbolt Gearbox Paddock Lockmaster Twin Cam Deadbolt Gearbox. The Gearbox is the part that is most likely to be at fault when the door lock fails and becomes unusable. Replacing the gearbox is cost effective, as it saves having to buy a complete new door lock. Should you need any help in measuring or fitting any of our products, please contact us Centre: 62/92mm Backset: 35mm or 45mm Case Height: 227mm Case Width: 47/57mm Operation: Twin Spindle
