Weed trimming apparatus, weed trimmer head, and trimmer line retention device

A trimmer head for a rotary cutting apparatus comprising:

• a body portion;
• a trimmer member passage extending through said body portion from a trimmer member entrance opening to a trimmer member install position;
• a first series of two or more trimmer members pivotally connected to said body portion in a first plane;
• a second series of two or more trimmer members pivotally connected to said body portion in a second plane that is generally parallel to and located above said first plane;
• a trimmer member fastening mechanism having a trimmer member engaging member pivotally movable between a first position and a second position, said trimmer member engaging member biased by a biasing mechanism into the second position such that the trimmer member engaging member extends across said trimmer member passage at said trimmer member install position, said engaging member being movable against such bias to clear said passage;
• a trimmer member forming a mount aperture proximate an insertion end thereof, wherein said trimmer member is secured to said body portion when said mount aperture occupies said trimmer member install position and said trimmer member engaging member extends through said mount aperture;
• and
• wherein said trimmer member is secured to said body portion by inserting said insertion end of said trimmer member into said trimmer member entrance opening and advancing said mount aperture through said trimmer member passage toward said trimmer member install position such that said insertion end contacts said engaging member and moves said engaging member to said first position to clear said trimmer member passage, said trimmer member engaging member having a longitudinal axis, and when in said first position, said trimmer member engaging member is disposed in a recess in said body portion and said longitudinal axis is oriented substantially parallel to a longitudinal axis of said trimmer member.