{HEAD ~ The instrument} 3 wherein said {TAIL ~ rotator} is configured to be manually actuated by a user of said instrument to change said rotational orientation of said opening 
wherein
{ HEAD ~ The instrument } 3 wherein said { TAIL ~ rotator } is configured to be manually actuated by a user of said instrument to change said rotational orientation of said opening
HEAD HEAD HEAD HEAD HEAD HEAD OTH REL OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH