28 fig1 and 2 and seal portion 34 fig1 and 2 to reconfigure the tool 10 accordingly when the tool 10 is reconfigured the outer sleeve assembly 30 is moved downwardly in the direction of arrow 46 relative to the tool mandrel 16 the outer sleeve assembly 30 further comprises a ratchet arrangement generally indicated by reference numeral 48 adapted to freely permit movement of the sleeve assembly 30 in the direction of arrow 46 relative to the tool mandrel 16 and to selectively permit relative movement of the outer sleeve assembly 30 and tool mandrel 16 in a direction opposite to arrow 46 thus the ratchet arrangement 48 is adapted to temporarily lock the tool 10 in the extended configuration shown in fig2 a detailed description of the ratchet arrangement 48 and its operation is provided hereinafter below reference is now made to fig3 b in which the remaining portion of the outer sleeve assembly 30 is shown as noted above the assembly 30 comprises sealing member 34 which is secured with the sleeve assembly 30 by threaded connections 50 52 and is supported by seal supports 54 56 the sealing member defines upper and lower annular notches 58 60 in an outer surface thereof and a central annular notch 62 in an inner surface thereof such that when a predetermined axial load is imparted on the outer sleeve assembly 30 the sealing member 34 deforms at the location of the notches 58 60 62 to provide the.