Abstract: A spool stores and dispenses filamentary material. The spool includes a back plate, a front plate and an outer hub around which the filamentary material is wound. The outer hub connects the back plate to the front plate. The back plate includes a pocket which extends inward from an outer edge. Securely positioned in the pocket is a resilient tab deflectable from a locked position into a released position and tending to return to the locked position, for capturing a loose end of the filamentary material between the resilient tab and the back plate in the locked position and for releasing the loose end in the released position.