From inside (document excerpt):
PARTS LIST NO. DATE 545014321 Replaces 545014320 06/13/06 WEED EATER R PARTS LIST PARAMOUNT PARTS LIST POULANR PARTS LIST Note: Illustration may differ from actual model due to design changes 4 6 R R CHAIN SAW MODEL(s) PP3516 PAGE NO. 12/14/06 1 27 1 2 3 TYPE 1,2 7 8 16 WARNING All repairs, adjustments and maintenance not described in the Operator’s Manual must be performed by qualified service personnel.