The serviceberry stave was flattened on the to be belly side with a draw knife then forced straight and flat between nails into a 2x4 which were then bent over. I cut some serviceberry trees 6 months ago. This one was only glued over on the ends and was still green until today. The previous one was flattened and attached like this when it was cut. It dried exactly as the nails held it. I,m kind of new here so who knows, others here are doing something similar.