unscrew (v)

After the rivet has been tightened, the tension bolt is unscrewed out of the nut when the trigger is pulled again.

You can shorten the Timing Belt if necessary by unscrewing the Cover Plate, shortening the Timing Belt and refitting it.

Universal lightweight hinge for doors and lids. Can be mounted on the inside or outside of the door (when mounted on the inside it cannot be unscrewed).