a joint connecting a pair of members rotatable about a common axis end to end includes a first member having a threaded end portion and a non - circular exterior surface rearwardly of the threaded end portion , a second member having a threaded socket wherein the threaded end portion of the second member can be engaged , and a non - circular exterior surface , a ground engagement sleeve having a non - circular profile on an inner surface thereof whereby the sleeve can be slidably mounted on the non - circular exterior profiles of the first and second members when such profiles are brought into alignment by rotation of one member relative to the other in a manner effective to pass torque from one member to the other by means of the non - circular profiles , a first pair of alignable holes in the sleeve and first member to receive a fastener to secure the sleeve to the first member and a hole in the second member penetrating the threaded socket and positioned to receive a fastener to secure the second member to a third member in place of the first member , the third member having a hole in a threaded end portion thereof alignable with the hole in the second member .