Ruggedly built, the main spindle had a 1-inch bore, a hardened and ground nose and a 40 MMS taper. The standard models ran on taper-roller bearings while the high-speed version, which could attain 5000 rpm, used pre-loaded ball races.

The spindle nose was provided with four holes tapped 5/16" x 18 t.p.i. Cap screws were fitted to diametrically opposed holes to act  as driving lugs for arbors whilst a notch was also cut in the mouth of the spindle to act as a means of positively driving collets or other fittings. A radial hole was also provided to carry a pin that engaged with the bayonet locks on short, quickly-interchangeable boring bars - these allowing the operator  to rough out and finish at one setting.

The more complex of the two optional vertical heads was driven from its own motor and mounted on the end of the round overarm; it was similar in appearance and design to the auxiliary heads made by Halco, Tree and the Kearney & Trecker "Midgetmill" and "Speedmill" units. To see how these units were arranged, and the range of their capabilities, click here.