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 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

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

£19.99 Sold out SKU: HS4329
Order by 2pm for same-day dispatch
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Same-day dispatch on orders before 2pm

The gearbox is the most common part to fail on a Mila multipoint lock — replace just this centre case, not the full strip, and save.Check your backset is 35mm before ordering.

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
Product overview

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.
Delivery & Returns

How much is delivery?

UK Mainland Delivery is £2.99 on all items no matter how many you order!

Northern Ireland, Scottish Highlands, Channel Islands £6.00.

We do not offer International Delivery (Ireland, France, Spain etc).

When will my order be dispatched?

Orders before 3pm (Monday to Friday) are usually dispatched same day but may take up to 24 hours.

When will I receive my item?

We ship on 2 working day courier. Fully Tracked. Tracking will be emailed on dispatch. 

Special order items such as keyed alike locks will take longer to dispatch. Please refer to product description for lead times. 

I haven't received my item?

Please email us your name, order number and date of purchase.

We prefer email as it allows us time to research and respond.

Returns Information

We operate a 30 day refunds and return policy. 

If you change your mind you must return the product back to us within 30 days of delivery

Please include a copy of your invoice and a note stating reason for return. 

Additional keys, locks keyed alike or built to code are non refundable as they are personalised made to order goods.

Any refund, which is due to a fault or other defect, will include a refund of the applicable delivery charges otherwise not. 

It is the buyers responsibility to arrange the return of goods to us. We do not offer a collection service for returning items. 

Items must be returned including original product packaging and accessories.

We reserve the right to refuse any returns that do not comply with this policy.

Please post returns to the following address:

Home Secure (Online)

Unit 5, Brookfield Drive

Liverpool, L9 7AJ

United Kingdom

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).