The positioning device 60 further comprises {TAIL ~ an electric motor} 68 being mounted onto the support structure 62 and for {HEAD ~ engagement} with the pulley assembly 64 
The positioning device 60 further comprises { TAIL ~ an electric motor } 68 being mounted onto the support structure 62 and for { HEAD ~ engagement } with the pulley assembly 64
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH