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Choosing uPVC Replacement Window Handles Window handles are a crucial component of your uPVC windows and must match to the existing frame. The key is the spindle's length, which determines whether your new uPVC handle will fit. Use the table below as a quick reference to determine the spindle length of your uPVC handle. This will ensure you order the right replacement window handle for your double-glazed window. Espag Handle Espag handles are commonly found on Upvc (but they are also used in timber