{HEAD ~ Each pair} of bracing members defines {TAIL ~ a guide} for the displacement of the end supports of the support roller for the lower belt 
defines
{ HEAD ~ Each pair } of bracing members defines { TAIL ~ a guide } for the displacement of the end supports of the support roller for the lower belt
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH