Patent ID: 7490459

Claim:
An apparatus for a mower comprising: a member adapted to rotate about an axis of rotation, the member having first aperture disposed therein, said aperture including an inner side nearest the axis of rotation, first and second sides and a outer side; the member also including a second aperture spaced from the first aperture; an adaptor, the adapter having a groove configured to engage the first and second sides of the aperture in the member; a first opening disposed in the adaptor, the first opening being located to align with the second aperture in the member when the groove is properly engaged with the outer side of the first aperture in the member; a second opening in the adaptor; and a ramp section disposed on the adaptor; a first fastener passing through the second aperture in the disc and into the first opening in the adaptor; a second fastener; a knife secured to the member by the second fastener passing through the second opening of the adaptor, the second fastener including at least one slot; and a third fastener having a key-hole shaped hole with a small section of the keyhole-shaped hole configured to engage with the at least one slot in the second fastener and an enlarged section of the keyhole-shaped hole configured to engage with the ramp section of the adaptor such that the second fastener is retained in position with the adaptor, and the adaptor is thereby secured to the member independently of the first fastener.