In an embodiment, {HEAD ~ the apparatus} can be used for mounting an arm on a bearing to form {TAIL ~ a pivot} 
In an embodiment , { HEAD ~ the apparatus } can be used for mounting an arm on a bearing to form { TAIL ~ a pivot }
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL