Reference numeral 47 denotes {TAIL ~ an adjusting knob} adapted to adjust {HEAD ~ the downward pressure} applied to the upper feed dog 40 
Reference numeral 47 denotes { TAIL ~ an adjusting knob } adapted to adjust { HEAD ~ the downward pressure } applied to the upper feed dog 40
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH