{HEAD ~ The cross arm} is preferably designed as {TAIL ~ a tubular beam} and has a non metallic cast filling on at least the drive end to form a heavy mass, preferably a mineral casting as the filling 
{ HEAD ~ The cross arm } is preferably designed as { TAIL ~ a tubular beam } and has a non metallic cast filling on at least the drive end to form a heavy mass , preferably a mineral casting as the filling
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL 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 OTH OTH OTH OTH OTH OTH OTH OTH