{HEAD ~ Bore} 37 extends horizontally at {TAIL ~ right angles} to bore 34 in top bracket 30 and accommodates set screw 39 
{ HEAD ~ Bore } 37 extends horizontally at { TAIL ~ right angles } to bore 34 in top bracket 30 and accommodates set screw 39
HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH