LOW PROFILE MOUNTING of cutters for truly versatile tool positioning, and EXTREMELY RIGID CUTTER MOUNTING for improved performance and accuracy.  In use, the cutter is positioned in the Arbor Assembly and is drawn together with the coupling nut which is only tightened “finger-tight”, no wrenches are required.  The Arbor Assembly is then inserted into the spindle of the milling machine where it is retained in the usual manner by the drawbar. At this point, Spirit Tool’s exclusive cutter holding feature permits all of the drawbar tightening force to be transmitted directly to the cutter faces. The tool, now an integral part of the quill, is ready for the most demanding performance in low-clearance work areas completely inaccessible to other arbors.The Spirit Tool Arbor has the nut on the other end where it can’t interfere. This keeps the cutter less than one inch from the spindle nose, providing the same rigidity of the quill. The Spirit Tool Arbor is a precision tool. The allowable tolerance on the work piece will not be used up by arbor runout. Saves minutes on every job; saves hours on tough jobs.