A set of metallic door lock center cases and gearboxes, typically used in multipoint door lock systems.
Diagram illustrating how to measure a Mila uPVC door lock centre case gearbox, showing the "Backset" (A) and "PZ" (B) dimensions for correct fitting.
A set of metallic door lock center cases and gearboxes, typically used in multipoint door lock systems.
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 XL Gearbox – Replacement Centre Case for uPVC Multipoint Door Lock – 35mm or 45mm Backset 92mm PZFullex XL Gearbox - 45mm Backset - 92mm PZ

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£38.99 SKU: HS5857
Backset
Backset
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 35mm or 45mm 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 XL Replacement Gearbox

The Fullex XL centre case gearbox is the mechanism inside your uPVC door that is operated by the handle. It is the part most likely to fail when a 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 35mm or 45mm Backset and 92mm PZ.

This gearbox is non-handed, fitting both left and right-handed doors. Available for single spindle, split spindle or dual spindle operation.
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 XL gearbox is the main internal mechanism in a multipoint door lock. It controls how the handle and key operate the locking points, ensuring your door locks securely.

Signs include a stiff or floppy handle, difficulty turning the key, or the door not locking properly. These issues usually indicate internal wear and should be addressed quickly.

No, compatibility depends on measurements such as backset, PZ centres, and the overall lock design. Always compare your existing gearbox before purchasing a replacement.

Yes, if you have basic DIY skills, replacing a gearbox is usually manageable. However, correct alignment is important for smooth operation and long-term performance.

Multipoint locks secure the door at several points along the frame, improving both security and sealing. Learn more in Beginners Guide to uPVC Door Locks.