I made two versions: one out of beech and oak and another out of birch and checker tree. The birch was glued from two 10 mm pieces out of reclaimed slatted. To get the spikes into the hammerhead secured it on the cnc and used a large 90° v-bit. Carefully engraving lines with a shallow depth per pass. On the last cut I even reduced the speed and made an extra shallow pass (0.2mm) to get a good surface finish. I soaked the hammer in olive oil to make it water resistant.