at the well site through the tool 10 to the space below the lower end of the mandrel 19 the main ports 15 could alternatively be provided through other latch mechanisms or through the lower end of the mandrel 19 itself the bore 13 and one or more actuation ports 36 through the wall of the mandrel 19 also form a fluid passage to conduct pressurized fluid into an annular space or chamber 38 between the mandrel 19 and the hollow piston 14 a tell tale hole 40 can also be provided through the spear 34 or alternatively through the lower end of the mandrel 19 from the bore 13 to the space below the lower end of the mandrel 19 a spring such as a wave spring 42 can be provided in a space between the uphole end of the collet 32 and the downhole end of the mandrel 19 to force the collet 32 downwardly against the fluid backpressure into abutment with the uphole end of the finger cage 20 this keeps the collet 32 longitudinally aligned with the tell tale hole 40 regardless of increased fluid pressure to block the tell tale hole 40 until latching occurs as described below 0023 fig1 shows the tool 10 in the running configuration with the free downhole ends 30 of the guide fingers 18 pivoted radially inwardly to their retracted positions in this configuration the return spring 22 exerts sufficient force to hold the piston 14 and the finger sleeve 16 in their respective downhole positions against the backpressure of fluid in the annular space 38 it can be seen that the finger sleeve 16 contacts the outer edges or surfaces of the fingers 18 to hold their.