A transverse movable support bar is mounted on {TAIL ~ the support arms} for supporting the post hole digger assembly balanced along the curved section of {HEAD ~ the boom} 
A transverse movable support bar is mounted on { TAIL ~ the support arms } for supporting the post hole digger assembly balanced along the curved section of { HEAD ~ the boom }
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD