e below operating piston extension 156 is a transfer support assembly 158 that includes a group of anti preset lugs 160 carried by a collet 162 anti preset lugs 160 are engaged against the lower shoulder of annular flange 164 which is formed on a tube guide extension 166 setting sleeve extension 166 is aligned to receive sleeve 168 the hang weight of packer assembly 102 is transmitted through a setting sleeve 170 through the anti preset lugs 160 and collet 162 to service tool mandrel 108 as such packer assembly 102 and the equipment attached thereto are supported by the work string 28 through service tool mandrel 108 anti preset lugs 160 and setting sleeve 170 this configuration results in a decoupling of handling forces which arise during the run in procedure with respect to shear pins 104 the service tool 100 is provided with a locking flange 172 which is engaged by a shoulder portion 174 of the collet 160 collet 160 is held in its position shown in fig2 e by its finger portions 176 having their head portions 178 received in a detent groove 180 formed in the service tool mandrel 108 above the upper shoulder of the locking flange 172 the head portion 178 is engaged and prevented from deflecting by a piston shoulder 182 which forms a part of operating piston extension 156 as best seen in fig2 e.