{HEAD ~ The center plate} 8 is formed with {TAIL ~ an elongated slot} 10 by means of which the lower part 1 can be displaced in relation to the upper part 2 and can thereafter be locked thereto 
is formed with
{ HEAD ~ The center plate } 8 is formed with { TAIL ~ an elongated slot } 10 by means of which the lower part 1 can be displaced in relation to the upper part 2 and can thereafter be locked thereto
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL 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 OTH OTH OTH OTH OTH OTH