A cartridge containing an endless loop of motion picture film is inserted into a projector having a shutter, a frame advancing claw and a resiliently mounted drive pinion. The cartirdge includes a drive wheel mounted in an opening therein which cooperates with the drive pinion of the projector for continuously advancing the film mounted in the opening. The resiliently mounted drive pinion is positioned in the projector so that it is beyond the dead center position of the drive wheel when the cartridge is fully inserted into the projector for holding the same in place.
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