This increase in tension is effective to rotate the film cassette 30 in a clockwise direction into the position shown in FIG 2 thereby causing the protruding portion 38 of the film cassette 30 to engage and move the pin 86 and {HEAD ~ the bell crank} 76 in {TAIL ~ a counterclockwise direction} about the pin 78 
This increase in tension is effective to rotate the film cassette 30 in a clockwise direction into the position shown in FIG 2 thereby causing the protruding portion 38 of the film cassette 30 to engage and move the pin 86 and { HEAD ~ the bell crank } 76 in { TAIL ~ a counterclockwise direction } about the pin 78
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