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