drill rod are offset by at least 0 030 inches in the depicted embodiment the threading step is accomplished by rotating the drill tool member while holding the drill rod member stationary it should be appreciated that alternatively the drill rod could be rotated while the drill tool is held stationary in the depicted embodiment the threading step includes relatively rotating the drill rod member and drill tool member between one to four full revolutions in alternative embodiments the threading step may include more or fewer revolutions in the depicted embodiment the toque needed to unthread the drill rod assembly from the drill tool assembly is less than 50 foot pounds the step of threading the drill tool assembly to the drill rod assembly includes rotating the drill tool member until a portion of the drill tool member e g annular shoulder abuts a portion of the drill rod member e g end face and limits further rotation in the depicted embodiment at least 0 030 inches offset is maintained when the portion of the drill tool assembly abuts the portion of the drill string assembly the at least 0 030 inches offset is maintained even if as much as 50 foot pounds of torque are applied to the connection between the drill rod member and drill tool member during the threading step in the depicted embodiment the boss on the distal end of the drill tool includes a maximum cross sectional dimension that is within 0 0015 to 0 03 inches 0 038 0 76 millimeters of a maximum cross sectional dimension of the aperture of the.