The device 4, characterized by the fact that the lever is in {HEAD ~ a position} which covers {TAIL ~ the control end} of the adjusting screw when the sliding element is in the position in which it engages the coupling means 
covers
The device 4 , characterized by the fact that the lever is in { HEAD ~ a position } which covers { TAIL ~ the control end } of the adjusting screw when the sliding element is in the position in which it engages the coupling means
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH