{TAIL ~ This central spindle} can be a solid post or it can be an annular shaft through {HEAD ~ the center} of which a light source can be directed 
{ TAIL ~ This central spindle } can be a solid post or it can be an annular shaft through { HEAD ~ the center } of which a light source can be directed
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH