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Cockspur wedge are the little white plastic blocks attached to the frame that the handle pulls in tight too (ramped shape and the yellowed bit in your photo).
The wedges are available in many sizes/depths to accommodate different handles.
Basically you want a thin steel ruler to measure between the window sash and the deepest part of the existing wedge. Usually somewhere between 6-15mm then you will know the handle to buy.
If you cant get the exact size handle just get the nearest and get a pack of assorted wedges too
I'm not a window expert but have had similar problems sourcing new handles to suit mine. The one in your above pic is a cockspur type (defined by the 'thumb' sticking out which holds against the frame). They come in different depths (aka stack heights or stepped heights) as Gazman16 explains. A suitable wedge is stuck/glued (or pegged and stuck/glued) to the frame for the 'thumb' to hold against.
In theory you simply need a suitable handle/wedge 'pair' to suit your stack height and away you go. But beware - the screw holes, the dimensions of the backplate, and the location of the centre spindle might all be different. You want to make sure your new handle backplate will cover the old holes, that new holes can be drilled, and the thumb will still be in line with the middle of your wedge.
BTW the other type of window handle in your other thread is an espag type (where there's no 'thumb' or wedge etc and the handle operates a mechanism inside the window instead)
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