Traditional Rose head copper cut nails are used with matching copper roves to form a copper rivet. These nails are extremely robust, easy to drive and when the wood fibers become damp and swell, will never work loose.
Copper Roves are slightly conical washers. A copper nail is hammered through the joint, a rove is pushed over the end (concave side inward) and the nail is peened over forming a copper rivet. Also similar to clinch or clench nailing. Copper rivets are often utilized in classic planked wooden boat construction.
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