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