The ball is attached to {HEAD ~ a shaft} which is, in turn, attached to {TAIL ~ an ultimate support mount} 
The ball is attached to { HEAD ~ a shaft } which is , in turn , attached to { TAIL ~ an ultimate support mount }
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL