Kore Gu Ferco (Old Style) Replacement Multipoint Door Lock Gearbox - 30mm Backset

The backset is the measurement from the edge of the door to the center of the large hole (where the handle spindle goes) or the center of the lock cylinder. This gearbox is available in 30mm or 35mm backset options. You must measure your existing lock to ensure you buy the correct one.

Old Style (Mark 1) GU Ferco locks typically have a specific shape and construction that differs from newer models. If your lock is no longer manufactured and has a rectangular central gearbox, it is likely an Old Style. Replacing a faulty handle or stiff operation is a common indicator. If unsure, compare your existing gearbox to images online or consult a locksmith.

This gearbox is specifically designed as a *replacement* part for existing, older GU Ferco multipoint locks. It is not intended for use in new installations unless specifically replacing an identical Old Style GU Ferco gearbox.

No, this product is the central gearbox mechanism only. You will reuse your existing door handles, cylinder, and any associated screws and fixings. Ensure these components are in good working order.

PZ refers to the distance between the center of the handle spindle hole and the center of the keyhole (or cylinder). For this gearbox, the standard PZ measurement is 92mm, which is common for most modern door hardware.

The installation is designed to be straightforward and can typically be completed with basic hand tools. If you are comfortable removing door handles and basic DIY tasks, you should be able to replace the gearbox yourself. Otherwise, a locksmith can complete the task quickly.

If the entire lock is seized due to a faulty gearbox, replacing the gearbox with this Kore unit should restore its functionality. However, if the seizing is caused by damage to the door or the main lock case itself, this part may not resolve the issue entirely.

Ensure the gearbox spindle is correctly seated and that the handle screws are fully tightened. Check that the PZ measurement (92mm) is correct for your door furniture.

Verify that the gearbox is correctly aligned within the lockcase. Ensure no wires or obstructions are interfering with the cylinder. Check for any damage to the cylinder itself, which may need separate replacement.

Confirm that the correct gearbox (30mm or 35mm backset) was installed. Ensure the gearbox is fully seated and secured. Test the operation with the door open to rule out alignment issues with the keep/strike plate on the frame.

Double-check that you have an Old Style (Mark 1) GU Ferco lock and that you have purchased the correct Kore replacement. Measure the backset and PZ to confirm compatibility. Minor adjustments to the lockcase may sometimes be needed, but significant modifications indicate a mismatch.