Fence wire tightener. Fence wire coiled around the winding mechanism (centre) of a fence wire tightener and attachment point. The loose wire is wrapped around the central cylinder, and then a winder is attached to the square end (lower left) and used to wind the wire until it is tight enough to form the required barrier. A pin (at right of cylinder) is then inserted and bent to prevent the mechanism uncoiling. Photographed in Scotland.