A cosmetic applicator includes an elongate hollow threadable insert having a mouth situated at a front end, an interior, and circumferential splines at an opposite end. An exterior surface of the opposite end of the insert includes an integral partially circumferential cam terminating in a radial edge, the insert having a direction of rotation about an axis of the applicator. A piston having a threaded rod is proportioned in diameter for push-fittable axial insertion through the threadable insert and engagement with a refill cartridge. The rod is proportioned in length to the threadable insert. The refill cartridge receives a stick or column of cosmetic to be applied to the user, and includes a front portion having an annular collar and a portion having a cylindrical internal diameter proportioned for press-fittable receipt of the threaded insert.