{HEAD ~ First pivot mount} 40 and second pivot mount 41 are formed on {TAIL ~ an upper surface} 50 of the support beam 31 
are formed on
{ HEAD ~ First pivot mount } 40 and second pivot mount 41 are formed on { TAIL ~ an upper surface } 50 of the support beam 31
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH