Euro cylinders are held in place by a Fixing Bolt that is screwed from the door edge through a threaded hole on the side of the cylinder under the cam. The cylinder size required is determined by the distance from each edge of the cylinder to the centre of the Fixing Hole.

1. Mark Long Cylinders - If the cylinder stick out more than 5mm then use a pencil to clearly mark the cylinder at the point that it leaves the backplate. This mark should then be used for measuring, rather than the end of the cylinder.
2. Remove the Euro Cylinder- You may need to insert your key into the lock and turn until you can pull out of the door
3. Lay the Cylinder Down - Place cylinder on it's side for measuring.
4. Get Measurement (a) - Measure from the left end of the cylinder to the centre of the Fixing Hole. If you marked the left side of the cylinder with a pencil, then measure from the mark rather than the end.
5. Get Measurement (b) - Measure from the centre of the Fixing Hole to the right end. If you marked the right side of the cylinder with a pencil, then measure to the mark rather than the end.
6. Check Measurements - Measure the overall length required, either from end to end or between pencil marks if marks were made. The overall length should equal the sum of measurements (a) and (b).
7. PLEASE NOTE WHICH SIDE IS EXTERNAL AND WHICH IS INTERNAL