Abstract: A vegetation trimmer with a hub and spool assembly has a cutting filament wound around the spool. The free end of the filament extends through an aperture in the hub into the cutting plane. The hub and spool are rotated at a high rate to allow the filament to cut vegetation. The spool includes a plurality of arms which engage with arms on the hub. When the spool is acted upon, the arms on the spool disengage with the arms on the hub to permit relative rotation of the spool to the hub to feed additional filament into the cutting plane. An indexing feature is used to regulate the amount of additional cutting filament that is allowed to be fed into the cutting plane. The arms on the hub selectively engage with the arms on the spool to limit the axial movement between the spool and the hub. Quick removal is permitted when the spool is rotated relative to the hub and spool assembly, and the arms on the hub no longer limit the axial movement of the spool, and the spool is removed from the hub and spool assembly.