Upvc door locks and most composite locks are called Euro Cylinders, they come in various sizes and are most commonly standard key hole shaped. It is imperative that you to measure the cylinder accurately and only fit the correct size cylinder for the Upvc door. A cylinder that protrudes more than 5mm from the handles is vulnerable from an attack called “snapping” and would allow a burglar to gain entry to your property in a matter of seconds. Removing the Cylinder: How to Change a UPVC Door Cylinder Cylinder Retaining Screw Locate and remove the cylinder retaining screw - this is a single cross head screw and is located in line with the lower portion of the cylinder. Insert your key into the cylinder and turn the key To align the cam inside the bottom of the cylinder while applying a little light pressure to the other side of the cylinder from the key and the lock should slide out. Top Tip. Loosening the handle screws may make it easier to remove the cylinder. measure upvc cylinder measure the cylinder Measure from the centre of the retaining hole to the end of the cylinder. Both sides of the cylinder will need to be be measured as some cylinders are not equal in length. Cylinder lengths increase in size by 5mm increments i.e. 30mm, 35mm 40mm, 45mm, 50mm and so on. Installing the new correctly sized cylinder. Insert the key into the cylinder and turn to align the cam in the bottom of the cylinder so that it is not protruding from the body. Slide the cylinder through the handles and secure with the retaining screw. After the cylinder in inserted lift the handles to engage the the multipoint then turn the key so that the bolt throws, by doing this you are certain to be aligned in the correct position. Mark The Cylinder Mark The Cylinder If the existing cylinder protrudes more than 5mm from the handles, mark the cylinder against the edge of the handles with a pencil before removal so that when it is removed you can measure from the retaining screw to the pencil mark so the replacement lock will be a flush fit and more secure. Upvc locks vary in price based on the size and the level of security they offer, at a minimum you should should only fit a lock that has 5/6 pins that includes security pins (this will make the lock better protected from picking and bumping) and has some measures that provide security from drilling.
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