The shim corrected the hingepin centre height when changing from 25 to 30 degree castor, thus keeping the roll centre correct.
It could not be moulded into the part as there are 2 shims required, one thicker than the other, to correct for both castor options (although why the thiner shim could not have been part of the moulding and then add / remove a thin shim as required is beyond me ... would save on the confusion as to which shim to run with which setting too!!!!!)
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