A spool for use in a trimmer head of a rotary trimmer having trimmer line is provided. The spool comprises at least three flanges (60, 61, 62) essentially parallel to each other. A passageway for the trimmer line is located between two of the flanges, the passageway (66) having opposed ends and extending from one side of the spool to an opposite side. The spool includes at least one inclining portion on one of the two flanges (60, 61, 62) about which the passageway (66) is located and at least one opening on the other of the two flanges (60, 61, 62) about which the passageway (66) is located. Each opening is in alignment and essentially contiguous with each inclining portion. The trimmer line may be wound onto the spool from the opposed ends of the passageway (66), between the two flanges (60, 61, 62) about which the passageway is located, up the at least one inclining portion, through the at least one opening, and into a space defined by the flange having the at least one opening and the third flange (62).
