Abstract: A system for positioning correction ribbons having a layer of opaque dry correction material over a letter or image on a surface such as paper for subsequent covering of the image. The system includes a supply spool rotatably mounted in a supply spool holder and a take-up spool rotatably mounted in a take-up spool holder. A hold-down member is adapted to pass the ribbon between the spool holders under the hold-down member in contact with the image. A window is formed by the hold-down member to allow placement of the ribbon and access to the ribbon by a stylus which is rubbed against the ribbon by the user in order to adhere the opaque material to the image.

Abstract: A system for mounting a gear member having gear teeth tilted in one direction onto a core pin of a mold. The gear member is a part of a drive gear member that rotates a pick-up spindle of a used ribbon in a cassette. The gear forms a center hole having a rim that has at least three keys that are adapted to slide upon at least three keyways formed by the core pin. The keys are positioned at such angular distance that a mirror image of the metal key member and the keys would not be adapted to be received by the keyways of the core pin.