GU Old Style 45mm Backset Gearbox

This replacement centre case gearbox is designed for the GU old-style 45mm backset multipoint door lock mechanism. In most cases, door lock issues stem from the gearbox, and replacing it is as simple as removing a few screws.

This version includes a faceplate extension but is compatible with all 45mm backset GU Old Style models.

Key Features:

• Backset: 45mm
• PZ Measurement: 92mm
• Functions as the internal mechanism operated by the handle
• Commonly the main issue when a lock fails
• Reversible latch for both left and right-handed doors

Technical Details:

A full technical diagram is available in the image gallery.