The switch means 45 then can switch between {TAIL ~ the various taps} to alter {HEAD ~ motor speed} 
The switch means 45 then can switch between { TAIL ~ the various taps } to alter { HEAD ~ motor speed }
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD