Abstract: Apparatus for cutting foliage having a rotating head and an annular ring mounted for independent rotation in the head. A cam follower is pivotally mounted in the ring and is guided along a circumferential camming surface formed in the head. The camming surface has spaced apart lobes located adjacent to stops. The free end of a supply line is passed over the cam follower and passed out of the ring to a predetermined cutting length. When the head is rotating at operational speed, the resultant centrifugal force of the follower and the line will hold the follower against the stop. If the line is worn or damaged the holding force is decreased and the follower is released and guided over the stop thus allowing the ring to turn relative to the head until the next stop is encountered. This causes a given amount of line to be played out to replenish the damaged or worn section.