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