{TAIL ~ A spring} 23, for example, a gas spring, acts on {HEAD ~ the axis} 22 of the guide roller 20 
{ TAIL ~ A spring } 23 , for example , a gas spring , acts on { HEAD ~ the axis } 22 of the guide roller 20
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH