Could not find a replacement “Adze Eye” style handle for our Ground Breakers brand mattock at any local supply store. The Adze Eye style handle is approx 1” in diameter at its bottom end, where your hand holds it. This end of the handle passes through the slightly tapered rectangular opening in the mattock cutting head. The tool head then slides up the length of the handle. The hickory wood adze eye handle is gradually tapered to an approx 1.25” X 2” rectangular tool-end. As the mattock tool head slides up the length of the 1”
diameter handle, it will gradually friction fit in the rectangular eye of the mattock tool head. We had to sand the hickory handle slightly to get a good friction fit with approximately 1/4 of wood protruding from the tool head once it was firmly friction seated. We have been using the mattock with its new handle extensively and are quite happy with the performance of this new handle.