{HEAD ~ The disc} 68 has {TAIL ~ a slightly smaller diameter} than the distance between the two legs so that it guides either one or the other leg 52 
has
{ HEAD ~ The disc } 68 has { TAIL ~ a slightly smaller diameter } than the distance between the two legs so that it guides either one or the other leg 52
HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL 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