https://www.repairmywindowsand....doors.co.uk/wisbech-
Replacing a UPVC Door Lock Mechanism It can be difficult to replace uPVC lock mechanisms in the absence of the appropriate tools and understanding. It is also essential to know the correct security measures prior to beginning any task. All locks require regular cleaning and lubrication in order to function smoothly. If you're experiencing an impossible-to-open uPVC door or the key is constantly turning inside the handle, it could be time to replace the lock cylinder. Lock Cylinder A lock cylinder is locat