How to Measure a Euro Cylinder

Step 1 : Remove the fixing screw that is located on the side of the door, in line with the bottom of the cylinder.

Step 2 : The key is needed to turn a cam that is holding the cylinder into the door.  With a pulling movement, turn the key slowly until you feel the cylinder pull out of the door.

Step 3 : Measuring the cylinder.  You need two measurements; from one end of the cylinder to the centre of the fixing hole (A) & from the other end of the cylinder to the centre of the fixing hole (B).