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Upvc Door Locking Mechanism Replacement - DIY Or Call in a Professional? The lock on your upvc door is a vital piece of security for your home. It can be frustrating to gain entry into your home when the lock is damaged or no longer works. Fortunately that replacing a multipoint locking mechanism is a DIY job that can be done easily. However, you should always ensure that you purchase a replacement lock from the same manufacturer to ensure it fits. Fixing a locked cylinder that is stuck Having a functiona