{HEAD ~ A third aspect} of {TAIL ~ the invention} provides a shim for arrangement against a structural component, the shim having a shim surface which is provided with a first feature defining opposite ends spaced apart by first distance and a second feature spaced from the first feature defining opposite ends spaced apart by a second, different distance 
{ HEAD ~ A third aspect } of { TAIL ~ the invention } provides a shim for arrangement against a structural component , the shim having a shim surface which is provided with a first feature defining opposite ends spaced apart by first distance and a second feature spaced from the first feature defining opposite ends spaced apart by a second , different distance
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