{TAIL ~ motor means} for mounting {HEAD ~ said weight} means to various positions along the beam to vary the load, 
{ TAIL ~ motor means } for mounting { HEAD ~ said weight } means to various positions along the beam to vary the load ,
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH