I am making didgeridoos (musical instrument) they are hollowed branches in essence. The method I make them is mostly sandwhich style (cut and bore) I am curious as to how I can add length to a almost finished piece with another type of wood I included some pictures of what I would like to do. I thought doing dowels would work, but was curious if anyone has any other ideas... I was also curious on any tips on how to keep the cut lengthwise seamless and hidden once put back together all advice is welcomed and appreciated. Thanks!