The extension member extends outwardly from the outer periphery in {HEAD ~ a first direction} of {TAIL ~ the imaginary line} for rotating the main body 
The extension member extends outwardly from the outer periphery in { HEAD ~ a first direction } of { TAIL ~ the imaginary line } for rotating the main body
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH