CTD-1 is designed for draw curtain machines equipped with 5" x 10" drums or 7" x 10" drums. Cable tension devices help reduce cable slack on motorized track systems. They also act as cable guides by maintaining the operating cable within the grooves of the cable drum. A Cable Tension Device can be used with most ADC machines and is strongly recommended for use with all motorized curved tracks. When a CTD is furnished as part of a machine, an emergency hand crank is not supplied. Any motor control purchased simultaneously with a Model 500 PATRIARC includes, at no extra charge, a Cable Tension Device. For all other applications it must be ordered. Models 2905, 6505 and 7005 are equipped with cable tension devices as standard equipment.