A device 5 wherein said first and second boards are provided with separate biasing means to bias said first board relative to said second board to disengage {TAIL ~ pins} that may be inserted into {HEAD ~ said openings} when said heat recoverable metal goes from its austenitic state to its martensitic state 
A device 5 wherein said first and second boards are provided with separate biasing means to bias said first board relative to said second board to disengage { TAIL ~ pins } that may be inserted into { HEAD ~ said openings } when said heat recoverable metal goes from its austenitic state to its martensitic state
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