112 allowing the spring in the fingers 114 to snap the heads 112 into slot 142 for the unlocked position note that the upper housing 118 and the lower housing 120 are secured together at 142 as seen in fig1 but can relatively rotate about the snap ring 144 thus with the heads 112 in groove 102 the upper housing 118 and lower housing 120 are in such a position the smart u00ae collet cannot find support by alignment of 18 with 20 even if collet 10 snaps into profiles 42 or 44 however the mandrel 100 with the housings 118 and 120 can still move relative to the outer assembly 50 so that the profiles in fig1 that are part of the outer assembly come into play fig1 shows one way to rotate heads 112 between the locked position of fig9 and the unlocked position of fig8 again in the unlocked position mandrel 100 can move enough to align 18 with 20 so that the collet 10 can find support in a profile such as 42 or 44 in the locked position of fig9 and 20 can 39 t align so that the collet 10 just snaps in and right out of profiles such as 42 and 44 in either case the mandrel 110 can move axially with housings 118 and 120 so that dogs 126 and 146 can interact with internal profiles 148 and 150 that.