How to replace a Multi-point Door Lock Gearbox (uPVC/composite door lock repair)

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In this video we are demonstrating how to change a multi-point door lock gearbox, otherwise known as a uPVC door gearbox or a composite door gearbox. You might also know this as a centre box, centre case or a back box for a multi-point door lock.
Each step of the video has been broken down into sections, including; how to change remove a door gearbox, how to reverse the latch of a door gearbox and finally how to replace the gearbox.
We also cover some general maintenance of a multi-point door lock including lubrication and checking the operation of it.
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