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There are two types of window handles used on uPVC windows. The older type of window handle is known as a Cockspur window handle. More modern windows will use espag window handles. Cockspur window handles use a spur which locks over the edge of the window frame to secure the window. Espag window handles use a spindle which operates a window locking mechanism inside the window.In this guide you will find measuring information for both of these types of upvc window handle.How to measure an es …