{HEAD ~ At least one buffering member}, such as coil spring, is preferably located between the second support and {TAIL ~ the second housing} 
is preferably located between
{ HEAD ~ At least one buffering member } , such as coil spring , is preferably located between the second support and { TAIL ~ the second housing }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH REL REL REL REL OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL