GU Ferco (Old Style) Replacement Gearbox (30mm or 35mm Backset, 92PZ Single Spindle) A cost-effective, high-quality fix for failing door locks! High-quality replacement gearbox designed as a compatible repair solution for Old Style (Mark 1) GU Ferco multipoint door locks. If your door handle has become floppy or the lock is jammed, replacing just the central gearbox is a fast and economical way to restore your door to full working order. These Kore gearboxes are engineered to replicate the fit and function of the discontinued GU units, delivering smooth, reliable operation and a straightforward installation. Available in 30mm and 35mm backsets, this single-spindle lock features the industry-standard 92mm PZ measurement to suit common lever/lever handles. It provides a durable, long-lasting repair solution for left- or right-hung uPVC, composite, and aluminium doors. Durably built to resist wear, it features a reversible sprung latch and robust deadbolt to maintain the security and integrity of your door. Features & Benefits Direct Compatibility - replaces discontinued Mark 1 "Old Style" GU Ferco gearboxes Cost-Effective Repair - save money by replacing just the faulty central mechanism Dual Size Options - 30mm or 35mm backsets to fit various door profiles Universal Handing - reversible sprung latch fits both left- and right-handed doors Standard Fitment - industry-standard 92mm PZ for use with existing lever handles Easy Installation - quick and straightforward replacement using basic hand tools Robust Construction - smooth, reliable, high-quality operating mechanism Enhanced Security - integrated deadbolt provides secure locking performance Did You Know? Old Style (Mark 1) GU Ferco gearboxes are easily identified by a "missing" top corner on the case profile. In contrast, New Style gearboxes feature a top vertical notch and a revised internal drive system. These two styles are not interchangeable, so always remove your existing gearbox and compare the case shape and notch profile before purchasing.
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