For example, {HEAD ~ elements} could be attached by means other than {TAIL ~ screws} in some cases 
For example , { HEAD ~ elements } could be attached by means other than { TAIL ~ screws } in some cases
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH