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