The optical directing members are selectively adjustable for accommodating {TAIL ~ components} of {HEAD ~ various sizes} 
The optical directing members are selectively adjustable for accommodating { TAIL ~ components } of { HEAD ~ various sizes }
OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD