{HEAD ~ Methods} of interconnecting the parts are known such as screwing, snap fitting, {TAIL ~ friction fitting} and gluing one part to the other 
such as
{ HEAD ~ Methods } of interconnecting the parts are known such as screwing , snap fitting , { TAIL ~ friction fitting } and gluing one part to the other
HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH REL REL OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH