As stated above, {HEAD ~ the situation} of the center of gravity can be adjusted by {TAIL ~ a partial cut} of the block, formation of concaved part, etc 
adjusted by
As stated above , { HEAD ~ the situation } of the center of gravity can be adjusted by { TAIL ~ a partial cut } of the block , formation of concaved part , etc
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH