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 the spindle as the collar is rotated with {HEAD ~ respect} to {TAIL ~ the axis} of the spindle 
to
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 the spindle as the collar is rotated with { HEAD ~ respect } to { TAIL ~ the axis } of the spindle
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