A line loader system for a rotating trimmer head includes a channel defined in the rotating trimmer head and having an entry slot, a curved track, and an outlet slot, a locking cleat formed in the rotating trimmer head adjacent the outlet slot, and a flexible line blade positionable and snap-lockable in the channel in a use position. The flexible line blade has a spade at a leading end and a neck adjacent the spade, where a width of the neck is narrower than a width of the locking cleat such that as the spade is positioned through the outlet slot past the locking cleat, the neck engages the locking cleat. With the described system, no mechanical devices are needed to secure the line blades, and no tools are required for installation or removal.
