The Sub-head speed reducer gave 1 revolution for every six of the headstock spindle which drove it. Besides its use in the relieving equipment set, it could also be employed to assist in the cutting of threads which had very long leads.

The precision Carriage Spacing Accessory had a dial that read to 1/10,000". The main unit clamped to the saddle and the bushed support to the bed. The carriage could then be accurately position anywhere within the 12" reach of the special high-accuracy leadscrew.