a feed dog 30 fig3 for corresponding movement of the work fabric with the position f and the position r also representing the maximum stitch length and the position 0 representing zero stitch length as hereinbefore mentioned the knob 14 and end 28 of lever 26 can be positioned at preselected positions between f 0 and 0 r respectively for preselected stitch lengths the free end 28 of lever 26 is toggled as at 32 to a connecting lever 34 which in turn is connected to a feed stroke adjusting element in the form of a relatively flat eccentric rotatable ring 36 through a connecting pin 38 on ring 36 thus movement of the lever 34 rotates the eccentrically mounted ring 36 about its centrally located supporting anchor ring 40 to position a bearing stud 42 the centrally located supporting anchor ring is relatively flat and is nestled within the movable ring 36 and is provided with a flange 44 which engages a counter bore 46 to provide the means for holding the ring 36 and provide a track for rotation therefor the supporting anchor ring 40 is simply attached to a web 48 fig2 of the sewing machine by a pair of machine screws 50 and 52 extending through suitable countersunk apertures 54 and 56 the ring 36 and supporting anchor ring 40 and bearing stud 42.