Bob, You just bend them! best not done on the car though. You can usually see them from the other side of the car, other bonnet open for veiwing! Then assess the bonnet element in relation to the wing catch. You can also see this from underneath the car as well but it will need lifting for good access. Its usually a two bend adjustment. Straightening the mid bend or increasing it lengthens and shortens the height, ie. where the hooked end sits then the top in or out for position. However it has always been my opinion that you want a little spring tension as this stops rattles and makes sure the bonnet is always being held tightly to the fixed catch. so ideally you don't want the moving element to return to the top position fully, rather just short of that and keeping tension on the catch.
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