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