First, the rim 303a may be moved to the opposite end of the mandrel, then the mandrel 305 rotated 180 degrees about an axis 311 through {HEAD ~ the center} of {TAIL ~ the mandrel} 305 
of
First , the rim 303a may be moved to the opposite end of the mandrel , then the mandrel 305 rotated 180 degrees about an axis 311 through { HEAD ~ the center } of { TAIL ~ the mandrel } 305
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 REL TAIL TAIL TAIL TAIL TAIL TAIL OTH