String head for a trimmer

A landscape trimmer comprising:

• a motor;
• an output shaft driven by the motor;
• and
• a trimmer head coupled to the output shaft and rotatable with the output shaft, the trimmer head operable in a fixed line configuration and a bump-feed configuration, the trimmer head comprising,
• a base including a cup having a top wall and a substantially cylindrical side wall that defines an aperture, the base including a collar extending axially from the top wall of the cup and for coupling the trimmer head with the output shaft, and the base further including at least one stop,
• a fixed line head at least partially received within the cup of the base when the trimmer head is in the fixed line configuration, the fixed line head including at least one channel having an inlet portion substantially aligned with the aperture of the base, an outlet portion, and a clamping member, the fixed line head engaging said at least one stop in a rotationally-fixed and driving engagement manner when the trimmer head is in the fixed line configuration, and
• a bump-feed spool at least partially received within the cup of the base when the trimmer head is in the bump-feed configuration, the bump-feed spool including a body and a trimmer line wrapped around the body, the trimmer line extending through the aperture in the side wall of the base when the bump-feed spool is received by the base, the bump-feed spool being in releasable and driving engagement with said at least one stop, said at least one stop allowing the bump-feed spool to rotate a predetermined angular distance with respect to the base upon contacting the trimmer head with an external surface.