A set of metal door lock mechanisms displayed against a white background, including a central case and single spindle parts.
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 displayed against a white background, including a central case and single spindle parts.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 30mm – Replacement Centre Case for uPVC Multipoint Door Lock – Single Spindle 92mm PZ

GUSKU: HS2852
Price:
£29.99

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 30mm Replacement Gearbox

The GU Old Type centre case gearbox (30mm backset) 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 30mm 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 of a multi-point door lock that controls the latch and locking points. It is specifically designed for older GU locking systems.

A 30mm single spindle refers to the backset measurement (distance from the edge of the door to the centre of the spindle hole) and indicates that the lock uses one spindle to operate both internal and external handles.

Signs include a floppy or stiff handle, the lock not engaging properly, or difficulty locking/unlocking the door. If these issues occur, replacing the centre case gearbox is often the best solution. For more insight into lock issues and risks, see Why Most Homeowners Don’t Upgrade Their Door Locks (And Why It Costs Them).

No, this gearbox is specifically designed for older GU multi-point locking systems. It’s important to match dimensions such as backset, spindle type, and fixing points with your existing lock.

Yes, with basic DIY skills you can replace the gearbox by removing the handle and lock strip. Following a proper step-by-step guide can help ensure correct installation and avoid damage.