In {HEAD ~ the case} of the exemplary embodiment according to FIG 9, the cap 7 again has a cutting ring 31 overlapping the sleeve 3 on the outside and having {TAIL ~ a multiple, steep thread} 32 
In { HEAD ~ the case } of the exemplary embodiment according to FIG 9 , the cap 7 again has a cutting ring 31 overlapping the sleeve 3 on the outside and having { TAIL ~ a multiple , steep thread } 32
OTH 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 OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH