Although {HEAD ~ motor} 68 can drive elongate member 30 by {TAIL ~ any conventional means}, a gear system 70 is preferably used 
Although { HEAD ~ motor } 68 can drive elongate member 30 by { TAIL ~ any conventional means } , a gear system 70 is preferably used
OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH