Hand-forged dowels for use in turning timber walls, for example. Two sizes. The stronger iron is intended to be driven in as a wedge between the logs and thus facilitate the work of driving the rope between the logs with the smaller iron. Once the gap has been filled with linen, the coarse driving iron is knocked aside and the timber collapses again. Lead hammers, a special tool that does not bounce and thus provides more power and force in the work, are used as striking tools for the driving iron.