A multi point locking mechanism this is normally a strip down the edge of the door with a few cases that sit inside.
How to change a lock upvc door.
How to change a upvc door lock.
Test the lock by turning the key both right and left a few times and gently tug on the key when it is turned to both.
All you need to replace your old upvc mechanism with a new central gearbox is a screw driver or drill and a spare 5 minutes.
As long as you have selected the correct size central gearbox you will have no difficulty in changing it over.
A few simple steps and tips for changing a upvc door lock in london 1.
Only remove the key from the lock once the retaining screw is secured back into place.