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.
How to change a upvc door lock barrel.
Locate the cylinder retaining screw using the cylinder as a guide and remove screw.
Open front door to reveal the face of the lock.
Put the key in the door barrel from the inside.
Only remove the key from the lock once the retaining screw is secured back into place.
With a barrel lock it s the cylinder that allows the locking and unlocking of a door.
Slacken the handle screws.
There are several types of cylinder locks.
Slightly loosen the door handle fixing.
How to change a upvc door lock.