Patent ID: 8910360

Claim:
An apparatus comprising: a shaft having a first end, a second end, and an axis extending through the shaft; a cutter associated with the shaft and having a first channel configured to receive the first end of the shaft and a portion of the shaft; and a sleeve configured to move along the axis within the first channel of the cutter and having a second channel configured to receive the first end of the shaft and the portion of the shaft and configured to be biased away from the second end of the shaft, a biasing system configured to apply a force on the sleeve in a direction along the axis away from the second end of the shaft such that a first end the sleeve engages a plastic insert while the cutter moves in the direction along the axis, wherein the biasing system comprises a spring having a first end and a second end in which the first end of the spring contacts the base portion of the shaft and the second end of the spring contacts a second end of the sleeve; wherein the first end of the shaft has a flange configured to retain the first end of the shaft within the second channel of the sleeve, and wherein a base portion of the shaft has a first engagement feature, the cutter has a second engagement feature at a first end of the cutter and a plurality of blades at a second end of the cutter, and the first engagement feature and the second engagement feature engage each other to retain the cutter on the shaft.