the panel fastener includes an externally driven crank having a first pin slidably engaging a first cam surface formed on a hook member . a second pin fixed on said hook member slidably engages a second cam surface having a fixed position . rotation of said crank on center axis induces cam action causing said hook member to first rotate and then retract . thereby , the hook member when located on one panel can engage a pin fixed on an independent second panel and join and draw together said panels . alignment of the pins and crank axis prevents loosening or disengagement of the joined panels without intentional reverse operation of the crank .