Three Fullex Type A door lock centre case gearboxes, shown from different angles, featuring robust metal construction and brass components for uPVC and composite doors.
Diagram illustrating how to measure a Mila uPVC door lock centre case gearbox, showing the "Backset" (A) and "PZ" (B) dimensions for correct fitting.
Three Fullex Type A door lock centre case gearboxes, shown from different angles, featuring robust metal construction and brass components for uPVC and composite doors.
Diagram illustrating how to measure a Mila uPVC door lock centre case gearbox, showing the "Backset" (A) and "PZ" (B) dimensions for correct fitting.
Fullex

Fullex Type A Gearbox – Replacement Centre Case for uPVC Multipoint Door Lock – 37mm Backset 68mm PZFullex Type A Gearbox - 37mm Backset - 68mm PZ

£79.99 SKU: HS3263
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 Fullex multipoint lock — replace just this centre case, not the full strip, and save.Check your backset is 37mm before ordering.

Key benefits
  • Direct Fullex replacement - matches the model in your door
  • Restores multipoint lock function - saves replacing the full strip
  • Check the model on your existing case - before ordering they vary
Product overview

Fullex Type A Replacement Gearbox

Need to fix your Fullex multipoint door lock? The Fullex Type A centre case gearbox is the mechanism inside your door that is operated by the handle. It is the part most likely to fail when a uPVC door lock stops working.

Replacing just the gearbox is far more cost effective than buying a complete new multipoint lock. The centre case simply re-attaches to your existing locking strip, so you do not need to replace the entire mechanism.

Key Measurements

The most important measurements to check before ordering are 37mm Backset and 68mm PZ (the distance between the handle spindle and the keyhole).

This gearbox is non-handed, which means it fits both left-handed and right-handed doors without modification.

Spindle Options

Single Spindle — for lever/lever handle operation (handles on both sides of the door).

Split Spindle — for lever/pad handle operation (restricts access from outside, ideal for

front doors).
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 Fullex Type A gearbox is the central component of a multipoint door locking system. It controls the handle and key mechanism, ensuring all locking points engage securely.

Common signs include a stiff or loose handle, difficulty locking or unlocking the door, or the locking points not engaging properly. Ignoring these issues can lead to complete lock failure.

No, compatibility depends on key measurements such as backset, PZ centres, and the lock configuration. Always check your existing gearbox specifications before replacing it.

Yes, in many cases you can replace just the gearbox rather than the full multipoint locking system, making it a more cost-effective repair.

A worn gearbox can eventually fail completely, leaving your door stuck locked or unlocked and compromising security. Learn more in The Silent Door Failure: How a Worn Gearbox Can Lead to Complete Lock Breakdown.