Turnbuckle 1
Turnbuckle 1 : A device used for tightening ropes, stays, etc. It consists of a central portion tapped in each end with a screw thread, one left-hand, one right-hand. Matching bolts (usually eyebolts) are fitted, so that when the bolts are held still and the central body is turned, both bolts will be pulled inwards towards the centre of the device or vice versa