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Lockmaster Milamaster Door Lock Replacement uPVC Gearbox 35mm Backset


Lockmaster / Milamaster Door Lock Gearbox Centre Case

Single Spindle

A replacement centre case for the Lockmaster / Milamaster door lock. If you're having problems with your door lock, the gearbox is almost always the problem and changing it is as simple as removing a few screws.

Product Information

  • Important measurements: 35mm Backset / 92mm PZ Centres
  • This is the mechanism inside the door that is operated by the handle.
  • Most likely to be the problem when a lock fails.
  • Reversible latch for left or right handed doors
  • Single Spindle - for lever/ lever operations


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  1. Well pleased 5

    Posted by Dennis Camwell on 11th Feb 2019

    After door locking and unable to open, I had to require locksmith to gain entry, cost was fair, for his knowledge, but I was horrified when he told me he had to replace the whole thing, could not just change gearbox quoted £240, just did not have that amount, but looked on Internet found GB DIY paid £19, recievd two days after fitted it myself took 20mins, and one very relived and happy customer