(a) a housing;

(b) a central support fixed within the housing;

(c) an cylindrical metallic tube diametrically fixed within the housing and forming a continuous circumferential passage for a trimming line;

(d) the cylindrical metallic tube avoiding the central support and forming at least one blade slot;

(e) the cylindrical metallic tube further having a first exit port and a second exit port;

(f) the first exit port forming a first convex surface of revolution about a central axis of the cylindrical metallic tube;

(g) the second exit port forming a second convex surface of revolution about the central axis of the cylindrical metallic tube;

(h) a gripper movable between a first position and a second position;

(i) the first position allowing the admittance of the trimming line through the cylindrical metallic tube;

(j) the second position providing for holding the trimming line in the cylindrical metallic tube;

(k) the gripper having at least one locking blade extending into the at least one blade slot, the locking blade having a clamp hole adjacent the circumferential passage;

(l) the locking blade cooperating with the cylindrical metallic tube to hold the trimming line when the gripper is in the second position;

(m) the housing further comprises a bottom portion and a top portion;

(n) the bottom portion including an integrally formed arcuate counterweight extending into the top portion;

(o) the integrally formed arcuate counterweight positioned adjacent the central support and generally opposite the cylindrical metallic tube;

(p) cylindrical metallic tube further comprises a generally rectangular cartridge having a first angled section, a guide section and a second angled section integrally formed and further forming a continuous guide channel;

(q) the first angled section having a first blade slot generally perpendicular to the guide channel; and,

(r) the second angled section having a second blade slot generally perpendicular to the guide channel.