The screws should only be present on one handle on one side of the door.
How to change a upvc door handle.
From there they go through it to hold the other handle in place.
You could approach this in a few different ways.
There are so many different sizes and only one size set will fit your upvc door handles.
The spring cassettes should be located over the spindle hole in the back of the door handle backplate.
Removing the old handle is very simple.
You just need to take out some screws and the door handle will come off itself.
Take your upvc handle off the door and measure from behind the backplate.
You will find the screws only on one handle and on one of its side.
If your upvc door handle is relatively modern then it will likely have spring cassettes already built into the handle which may be broken.
General guidance to assist our video.
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All you need to do is remove some screws and it will easily come away from the door.
With the upvc handle still fixed to the door use your ruler or tape measure to measure the sizes in situ.
Most upvc door handles have two screws and these are usually on clear display.
Most upvc door handles have like two screws and you can easily locate them.
Only remove the key from the lock once the retaining screw is secured back into place.
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.
Draw around the backplate with a fine pencil on a piece of paper and.
Perhaps you have a broken door handle or would like to.
Measure the size from the centre of the top screw hole to the centre of the lever and also measure the size.
How to replace upvc door handles firstly measure the size between the centre of the key hole and the centre of the lever and make sure that you find.
They go right through to hold the other handle in place from behind.
To check this you will need to remove your door handle by unscrewing the two screws visible on the internal handle.