A metal door lock center case gearbox typically found inside a door, operated by a handle, with visible metal components and mechanisms.
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 metal door lock center case gearbox typically found inside a door, operated by a handle, with visible metal components and mechanisms.
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 Crimebeater Gearbox – Replacement Centre Case for uPVC Multipoint Door Lock – 35mm/45mm/55mm Backset 92mm PZFullex Crimebeater Gearbox - 35mm/45mm/55mm Backset - 92mm PZ

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£38.99 SKU: HS10798
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/45mm/55mm 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 Crimebeater Replacement Gearbox

The Fullex Crimebeater 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, 45mm or 55mm Backset and 92mm PZ.

This gearbox is non-handed, fitting both left and right-handed 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 Crimebeater gearbox is the central mechanism in a multipoint door lock. It controls the handle and key operation, ensuring all locking points engage securely.

Common signs include a stiff or floppy handle, difficulty turning the key, or the door failing to lock properly. These issues usually indicate internal wear within the gearbox.

No, compatibility depends on measurements such as backset, PZ centres, and overall lock design. Always match your existing gearbox specifications before purchasing.

Yes, in many cases you can replace just the centre case gearbox rather than the entire multipoint lock. This is often a more cost-effective solution.

A worn gearbox can compromise both security and usability, increasing the risk of lock failure or forced entry. Learn more in Why Most Homeowners Don’t Upgrade Their Door Locks (And Why It Costs Them).