Abstract: A kit for servicing the interior working parts of a cartridge type tape playback unit comprising a completely hollow cartridge case having parallel track guide means disposed in its two sides. The hollow cartridge case is designed to actuate the unit when it is inserted in the unit and provide the user of the kit with an unobstructed view of the playback head, the capstan and the sensing poles as well as other similarly disposed interior working parts over which the tape would normally travel. A tool holder having a plurality of interchangeable service heads is provided. Two of the heads, one of abrasive material and the other of felt or the like, are formed with a concave cleaning surface and are dimensioned so as to be received between the guides in the side walls of the cartridge case. Another cleaning head includes cutter blades and a magnet and is also sized so as to be received within the guides.

Abstract: A kit for cleaning the interior working parts of a cartridge type tape playback unit comprises a completely hollow cartridge case having parallel track guide means disposed in its two sides. The hollow cartridge case is designed to actuate the unit when it is inserted in the unit and provide the user of the cleaning kit with an unobstructed view of the playback head, the capstan and the sensing pole as well as other similarly disposed interior working parts over which the tape would normally travel. A tool holder having three interchangeable heads is provided. Two of the heads, one of abrasive material and the other of felt or the like, are formed with a concave cleaning surface and are dimensioned so as to be received between the guides in the side walls of the cartridge case. The guides are aligned with the capstan so as to direct the concave surface of the cleaning head into intimate contact with the capstan surface.