{HEAD ~ The chain guide} 50 is secured by a support 52 to {TAIL ~ the rail} 40 
is secured to
{ HEAD ~ The chain guide } 50 is secured by a support 52 to { TAIL ~ the rail } 40
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH