The object is a multi strike film ribbon cartridge. Package labeling "RIBBON REMOVAL 1. Push roller clip C off cartridge and lift cartridge free of ribbon guides. RIBBON I INSTALLATION 1.Remove ribbon slack by turning knob A in direction of arrow. 2 Position ribbon in front of ribbon guides B. Use guide pins to position and mount cartridge on plate. 3. Pull roller clip C over cartridge. 4. Rotate knob A in direction of arrow 1/4 turn until drive gear engages."