An adjusting collar connects with the spindle and threads cooperatively disposed on the confronting surfaces of the spindle and collar permit the collar to move axially up and down along the axis of {HEAD ~ the spindle} as {TAIL ~ the collar} is rotated with respect to the axis of the spindle 
An adjusting collar connects with the spindle and threads cooperatively disposed on the confronting surfaces of the spindle and collar permit the collar to move axially up and down along the axis of { HEAD ~ the spindle } as { TAIL ~ the collar } is rotated with respect to the axis of the spindle
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