By means of {HEAD ~ such an arrangement} intermediate positions of the guide disc can also be effected, while a very compact configuration of the positioning unit is obtained at {TAIL ~ the same time} 
By means of { HEAD ~ such an arrangement } intermediate positions of the guide disc can also be effected , while a very compact configuration of the positioning unit is obtained at { TAIL ~ the same time }
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL