The light source is capable of sending {HEAD ~ a light} to the light receiving means of {TAIL ~ the editing wheel} 
The light source is capable of sending { HEAD ~ a light } to the light receiving means of { TAIL ~ the editing wheel }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL