The pitman attachment herewith shown is so constructed that the machine can be operated by the feet or by hand as may be desired. The pitman shown in Fig. 1 is formed of an upper and lower section united by a turnbuckle; pivoted to the lower part of the lower section is a clamp, and at some distance from the top of the upper section is a second clamp. These clamping pieces, Fig. 2, have semicircular grooves in their inner sides, and with corresponding grooves in the sections form apertures for receiving the pivot on the treadle and the crank of the shaft carrying the hand wheel; the top clamp has two recesses of different sizes to adapt it to shafts of different diameters. On the end of the upper section is a disk, Fig. 2, against the inner toothed face of which is pressed a similarly formed disk on the end of a bar having a handle on its outer end; a bolt holds the disks together. The handle bar can thus be held and locked at any desired inelinatSh. By means of the turnbuckle the length of the pitman can be increased or diminished as required. The crank shaft can be revolved either by working the treadle with the feet or by means of the rod. In case the machine is not provided with this pitman, a bar is clamped on the usual pitman near its top, Fig. 3, the handle bar being pivoted to this bar; the joint is made with toothed disks for holding the handle at any desired angle. If necessary, the curved handle bar shown in Fig. 4 may be clamped directly on the pitman. This invention has been patented by Mr. P. S. Roy, of 26 North 15th Street, Denver, Colorado.