Mila uPVC door lock centre case gearbox with twin spindle design and multiple latch openings for enhanced security.
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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Mila uPVC door lock centre case gearbox with twin spindle design and multiple latch openings for enhanced security.Diagram illustrating how to measure a Mila uPVC door lock centre case gearbox, showing the "Backset" (A) and "PZ" (B) dimensions for correct fitting.

Mila Gearbox Twin Spindle – Replacement Centre Case for uPVC Multipoint Door Lock – 35mm Backset 92/70mm PZ

MilaSKU: HS4329
162 reviews from verified buyers
Price:
£19.99

Key benefits

  • Direct Mila replacement - single or twin spindle versions
  • Restores multipoint lock function - saves replacing the full strip
  • Standard Mila dimensions - measure your case before ordering

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Description

Mila Twin Spindle Replacement Gearbox

This genuine Mila twin spindle centre case gearbox is a direct replacement for Mila, Coldseal and Swift-Frame multipoint door locks.

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 / 70mm PZ.

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

Compatible Brands

Suitable replacement for Mila, Coldseal and Swift-Frame multipoint door locks.

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Frequently Asked Questions

The Mila twin spindle gearbox is the central mechanism in a multipoint locking system, allowing separate control of the internal and external handles for enhanced security and functionality.

A twin spindle system uses two separate spindles—one for the inside handle and one for the outside. This allows features like split operation, often used with night latches or enhanced security setups.

Signs include a loose or stiff handle, difficulty locking or unlocking, or the door not securing properly. These issues usually indicate internal wear within the gearbox.

No, compatibility depends on factors such as backset, PZ centres, and whether your door uses a split spindle system. Always match your existing gearbox specifications before purchasing.

A worn gearbox can reduce security and lead to complete lock failure over time. Upgrading ensures reliable performance and better protection. Learn more in Why Most Homeowners Don’t Upgrade Their Door Locks (And Why It Costs Them).