engagement member 14 and any object to which it is attached is secured to the base portion 12 the engagement member 14 preferably has at least one rounded portion 44 to allow the engagement member 14 to rotate around the engagement pin 28 as illustrated by the arrow a in fig1 it should be noted that the engagement member 14 may be of any appropriate shape that allows rotation of the engagement member 14 around the engagement pin 28 for the reasons noted below see also fig4 6 and 8 while a cord 38 is shown in the figures for disengaging the engagement pin 28 from the engagement member 14 any mechanical release could be used for example a cam could be used which when rotated would pull the engagement pin 28 from the engagement member 14 similarly a bell crank a neck linkage etc would all be within the scope of the present invention the base portion 12 also has a bias pin 46 and spring 48 in a cylindrical portion 49 as illustrated in fig3 the spring 48 is again a helical spring but could be any type of spring or elastic element the bias pin 46 and spring 48 are.