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 {HEAD ~ the film cassette} 30 to engage and move the pin 86 and {TAIL ~ the bell crank} 76 in a counterclockwise direction about the pin 78 
to engage
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 { HEAD ~ the film cassette } 30 to engage and move the pin 86 and { TAIL ~ the bell crank } 76 in a counterclockwise direction about the pin 78
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH