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Double Glazing Spares

Lockmaster/Milamaster Central Gearbox Lockcase Only

Please Choose:


Spindle Holes

from £29.60 Ex VAT
£35.52 Inc VAT


Lockmaster Door Lock Gearbox Specification:

Spindle to key: 92mm
Backset: 35mm, 45mm
Lever Lever locking operation or (unsprung will work with lever/pad handles)
1 centre latch
1 deadbolt
The mechanism can be handed LH or RH by removing the centre latch and turning it.
The letters LOCKMASTER or MILAMASTER will be engraved somewhere on the lockstrip.

Click here to view "Backset" and "Spindle to key" measurements

diagram of lever/lever handle

Click here to view suitable lever/lever handles for the Sprung (single spindle) Gearbox.

diagram of lever/lever handle

Click here to view suitable lever/lever handles for the Unsprung (twin spindle) Gearbox.

diagram of lever/pad handle

Compatible Lever/Pad handles for the Unsprung (twin spindle) Gearbox:
Hoppe 270mm Lever/Pad door handles.
Hoppe 240mm Lever/Pad door handles.

Please check that these handles cover any existing screw holes in the door.

Fitting this Lockmaster centre lock case

Remove the Lockmaster Multipoint (lock strip) lock from the door by first removing the handles, the lock barrel and the screws that hold the strip to the side of the door. With the Lockmaster lock strip removed, remove the centre case screws that hold the Lockmaster gearbox onto the locking strip, swap the gearbox, and put the whole locking system back in the door. Simple 20 min job using a screw driver.

This Lockmaster case will replace the gearboxes the current type Lockmaster upvc door locks and. Although the Lockmaster multipoint locks have different widths and different locking points, they use exactly the same gearbox to operate the mechanism. To identify which make of lock you have, look on the locking strip when the door is open, it should have the makers name on it.

  • Model: WW-DBLMGB
  • Manufactured by: Lockmaster