A set of metal door lock mechanisms, including a central case and spindle, typically used for multipoint door locks.
Diagram illustrating how to measure a Mila uPVC door lock centre case gearbox, showing the "Backset" (A) and "PZ" (B) dimensions for correct fitting.
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A set of metal door lock mechanisms, including a central case and spindle, typically used for multipoint door locks.Diagram illustrating how to measure a Mila uPVC door lock centre case gearbox, showing the "Backset" (A) and "PZ" (B) dimensions for correct fitting.

GU Old Type Gearbox 35mm – Replacement Centre Case for uPVC Multipoint Door Lock – Single Spindle 92mm PZ

GUSKU: HS2851
Price:
£14.99

Key benefits

  • Direct GU Old Type replacement - 35mm backset, single spindle
  • Restores multipoint lock function - no door alteration required
  • 92mm PZ standard fitting - measure your case before ordering
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Description

GU Old Type 35mm Replacement Gearbox

The GU Old Type centre case gearbox is the mechanism inside your uPVC door that is operated by the handle. It is the most common part to fail when a GU multipoint door lock stops working.

Replacing just the gearbox is far more cost effective than buying a complete new lock. The centre case re-attaches to your existing locking strip.

Key Measurements

The most important measurements are 35mm Backset and 92mm PZ. Other sizes on the product are provided for reference only.

This gearbox is non-handed, fitting both left and right-handed doors. Single spindle operation.

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Frequently Asked Questions

A GU old type centre case gearbox is the internal mechanism within a multi-point door lock that controls the latch and locking points. It is designed specifically for older GU locking systems.

A 35mm single spindle refers to the backset measurement from the edge of the door to the centre of the spindle hole. It also means the lock uses one spindle to operate both internal and external handles.

Common signs include a loose or stiff handle, difficulty locking or unlocking the door, or the lock failing to engage properly. If you notice these issues, the gearbox may be worn and need replacing. For more guidance, see Check This Before Your Next Let-In: Is the Door Gearbox Still Fit for Purpose?.

No, this gearbox is specifically designed for GU multi-point locking systems. Always check measurements such as backset, spindle type, and fixing points to ensure compatibility.

Yes, if you have basic DIY skills, you can replace the gearbox by removing the handles and lock strip. Following proper guidance will help ensure a correct and secure installation.