{HEAD ~ Tensioning springs} 26 are provided between screw heads 24 and {TAIL ~ washers} 25 contacting member 12 
are provided between
{ HEAD ~ Tensioning springs } 26 are provided between screw heads 24 and { TAIL ~ washers } 25 contacting member 12
HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH