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