a slider held within the housing and in {TAIL ~ sliding contact} with the second portion of {HEAD ~ the arm} inside of the housing 
a slider held within the housing and in { TAIL ~ sliding contact } with the second portion of { HEAD ~ the arm } inside of the housing
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH