Roto Door Lock Gearbox Centre Case Replacement uPVC 35mm Backset Single Spindle

Replacement Roto Door Lock Gearbox 35mm Single Spindle
A replacement centre case gearbox for the Roto multipoint door lock mechanism, also known as a Roto old style gearbox. 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.

Information
Important Measurements: 35mm Backset / 92PZ 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
Technical
A full technical diagram is included in the image gallery.