Maco Old Style 35mm Deadbolt Replacement Gearbox Maco Old Style 35mm Replacement 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. Lift the lever to engage locking mechanisms and then one full turn of the cylinder to lock. One full turn of the key then push down on the lever to unlock. Should you need any help in measuring or fitting any of our products, please contact us. Euro Profile Lockcase Centre Gearbox only Single Spindle Backset: 35mm Case Height: 226mm Case Width: 50mm Centres: 92mm Operation: Lever Lever
