a shaper cutter includes a body having teeth formed around its periphery and further includes a thin wafer disposed against a conical face of the body and formed with peripheral cutting teeth which lie against the teeth of the body , the teeth of the wafer serving to cut a workpiece and being backed by the teeth of the body . as the wafer is clamped to the body , it is flexed from a flat condition to a deflected condition in which the wafer lies against and conforms to the conical face of the body . to hold the deflected wafer in a rigidly fixed angular position on the body , a pin which is anchored to the body projects into a hole in the wafer . the hole is specially located and configured to coact with the pin to orient the wafer angularly relative to the body prior to deflection of the wafer and then to establish substantial areas of surface contact with the pin after deflection of the wafer . the substantial surface contact areas reduce deformation at the interface of the hole and the pin and thus reduce angular shifting of the wafer when tangential cutting forces are imposed on the wafer and serve to maintain the wafer in a rigidly fixed angular position relative to the body .