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