once the retrieving collet 54 starts to pull on the tubing section 10 the latch collet fingers 28 can deflect outwards and pass over the male connector profile 86 referring back to fig1 and 15 in fig1 the female connector portion 12 has been successfully released from the adjacent male connector portion 84 and the tool 40 is moving through the tubing string 10 to a position where the retrieving collet profile 58 can engage an internal profile 38 defined by the male connector portion 14 as the retrieving collet shear screw 72 is at the maximum extent of its travel within slot 74 the force applied from surface to the retrieving tool 40 will cause the tubing string 10 to lift to surface as shown in fig1 if for whatever reason the latch support sleeve 32 will not move the tool 40 is adapted to release from the female connector portion 12 without causing damage to the connector portion 12 this is now described with reference to fig2 to 25 partially cut away perspective views of the releasing collet 46 passing the latch sleeve no go 96 referring firstly to fig2 debris 102 has built up behind the support sleeve 32 this debris 102 is preventing the sleeve 32 from moving to a position in which the no go 96 can enter the recess 100 and permit the tool 40 to vacate the female connector portion.