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uPVC Window Handle Replacement Window handles that fail can be annoying, and they may prevent your windows opening. This is because the spindle inside the handle rotating but not communicating with the shoot bolt or the roller cam of the window mechanism. This is a simple fix. We offer a variety of replacement handles for upvc inline key locking, cranked or cranked Espag and Cockspur. Remove the old handle uPVC is an excellent option for those who want to improve their house. They give a beautiful appearance while cutting down on the cost of energy.