A cartridge and method that is useful in installing an endless belt in one or more modules of a belt containing system is disclosed. The cartridge may include at least two internal cartridge rolls around which said belt is wound, a traveling roll around which belt is positioned, and gear racks on which said traveling roll will move, said belt being movably connected on one end to one of said internal cartridge rolls and on an opposite end to said traveling roll, end caps located at each end of said internal cartridge rolls, said end caps and internal cartridge rolls having conduits therethrough, and a sheath to cover and contain said internal cartridge rolls.