{TAIL ~ A toggle lever system} with {HEAD ~ links} 13a, 13b engages each of the bearings 11, 12 
{ TAIL ~ A toggle lever system } with { HEAD ~ links } 13a , 13b engages each of the bearings 11 , 12
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH