Shrinking scales are a fairly common problem. It's rather frequent on Red Imp's. If the blade won't hit the pin, you can use a needle file to shorten the wedge (careful not to file the scales). If it's so bad that the blade will hit the pin, my first thought is to rescale it. Second thought is maybe you can take it apart, shorten the wedge, and then glue the wedge in so you don't need a pit but a) that might not hold and b) it would look weird with the holes for a pin but no pin.