To joint the spruce slats I would like to try a tongue and groove method to get better alignment and more glue surface area. The project is 8mm thick. The edges of the completed soundboard are tapered from 8mm to 5mm sanding on only one side beginning about 8 inches from the edge of the soundboard. To allow this amount of sanding the tongue part has to be about 4mm below the face of the board. I figure a 1/16th to 3/32 tongue is all that is needed but instead of the typical T&G where the tongue is centered, it will have to be offset to allow the 4mm top thickness. Do you know of such a bit set or can you direct me to have one custom made? Thank you.
-Tom Z.
Walker, IA
