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