WEEDTRIMMER - - MODEL NUMBER WT4000E KEY NO. PART NO. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 20 21 22 23 24 25 26 27 28 29 30 174024X550 Chassis Assembly 174040 Line, Trimmer .155 diameter x 18.75 long 150078 Screw, Self-Tapping 5/16-18 x 1 169790 V-Belt 172145X004 Bracket, Idler 166042 Pulley, Idler, V-Groove 173716 Bolt, Hex Head 3/8-16 x 1.