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