The ornamental design for a trimmerhead for use in flexible line rotary trimmers, as shown and described.
FIG. 1 is a perspective view as seen from above of a trimmer head for use in flexible line rotary trimmers showing my new design, with a line inlet/outlet eyelet in a side of the housing and a trimmer drive shaft receiving aperture in the upper end of the housing being illustrated in broken lines;
FIG. 2 is a perspective view thereof as seen from below with locking apertures in a lower housing surface and a line inlet/outlet eyelet in a side of the housing being illustrated in broken lines;
FIG. 3 is a top plan view thereof;
FIG. 4 is a front view thereof;
FIG. 5 is a side view thereof as seen from the left side of FIG. 3;
FIG. 6 is a side view thereof as seen from the right side of FIG. 3;
FIG. 7 is a rear view thereof; and,
FIG. 8 is a bottom plan view thereof.
The broken line showing of the trimmer head is included for the purpose of illustrating portions of the article and forms no part of the claimed design.