bleedoff tool body by thread 24 communicating flow passage 19a with the interior of the handling string or if no conduit is connected flow passage 19a will communicate with the riser interior at any time during running in or pulling the test string from a well the full weight of the test string suspended from the bleedoff tool will pull the tool mandrels piston out of the tool bodies reducing liquid pressure in chamber c and increasing the normal length of the bleedoff tool until friction surface 38b contacts friction surface 30b when these friction surfaces contact torque may be transmitted through the bleedoff tool the friction surface roughness may be increased or friction surfaces grooved to create a clutching action and increase torque transmitted by the bleedoff tool when the friction surfaces contact when it is necessry to operate the bleedoff tool almost the total weight of the test string is supported by hanger 11 on internal shoulder 17 and only the weight of the handling string above the bleedoff tool is supported by the bleedoff tool this weight loads the bleedoff tool bodies moving friction surface 30b from contact with friction surface 38b increasing the pressure in liquid chamber c when the friction surfaces are not contacting the liquid chamber acts as a liquid bearing supporting the weight of the handling string and providing low friction rotation of the bleedoff tool bodies around the tool piston.