Can i ask ,is there a reason why you wouldn't put dowels in to join the two together,itll be a tad heavier, but the joint would be stronger ,in my opinion
You are correct. But I believe all the strength is is the rails of a surfboard therefore I don’t like to put dowels in. You make a breaking point at either end of the dowel. This will be due to the dowel being to stiff and not flexing. I’ve seen it a million times. Hope this helps