Tool and tool holder assembly

An assembly comprising:

• a tool having an elongated body with a socket and a groove;
• a tool holder having a body with a first bore configured to receive at least a portion of the elongated body, and a second bore substantially transverse to the first bore;
• and
• a screw including a body portion, a head portion, and a pin, the head portion having a curved surface at an end thereof, and a channel extending in a radial direction transverse to an axis of the screw, the channel being configured to receive a portion of the pin such that an end of the pin extends from the head portion;
• wherein in an assembled state, a portion of the elongated body of the tool is positioned within the first bore of the body of the tool holder such that the socket and the second bore are substantially aligned, and the screw is positioned within the second bore with the pin seated in the groove and the curved surface pressed against the elongated body in the socket at a predetermined torque.

A method comprising:

• providing an assembly including:
• a tool having an elongated body with a socket and a groove extending from the socket;
• a tool holder having a body with a first bore configured to receive at least a portion of the elongated body, and a second bore substantially transverse to the first bore;
• and
• an impinging member including a body having an end with a curved surface and an extension extending radially from the body;
• inserting a portion of the elongated body of the tool into the first bore of the body of the tool holder until the socket in the elongated body is substantially aligned with the second bore in the body of the tool holder;
• and
• inserting the impinging member into the second bore until the curved surface of the end of the body of the impinging member is pressed against the elongated body in the socket at a predetermined torque, and the extension extending radially from the body of the impinging member sits in the groove in the elongated body extending from the socket to ensure that the predetermined torque is met.