from outer surface 25 with cutting edge 28 formed at the juncture between side surface 26 and outer surface 25 and cutting edge 29 formed at the juncture between side surface 27 and outer surface 25 as is evident from the foregoing detailed discussion by employing this construction the formation of single continuous elongated helically shaped spring like ribbon coil member 21 simultaneously creates all of the plurality of cutting edges required for cooperative engagement with an apertured foil or mesh screen as a result by employing the present invention the simple formation of elongated continuous helically shaped coil ribbon member 21 eliminates the need for a separate and independent cutting blade to be formed and individually mounted to an elongated support rod in this way substantially improved and enhanced manufacturing and production capabilities are realized with an entire cutting blade assembly being achieved at a substantially reduced cost in order to impart sufficient rigidity to elongated continuous helically shaped spring like ribbon coil member 21 for enabling coil ribbon member 21 to be reciprocatingly moved along the inside surface of a cooperating mesh screen or apertured foil cutting blade assembly and support system 20 preferably comprises coil holding bar 22 in its preferred construction coil holding bar 22 comprises a longitudinally extending centrally disposed elongated mounting post 31 with a plurality of support panels 32.