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Replacing uPVC Window Handles Switching the handles of windows made of upvc is an easy job. The important thing is to make sure that the new handle is a good fit for the spindle carved out in the window mechanism. If the steps below are followed properly the cockspur handle will fit most windows. The most important thing is the step height of the handle. What to Do Look For? A large portion of windows in the UK come with uPVC handles, and over time they can begin to show signs of we