Talking about a joint here means the connection between two different wooden parts of the instrument: the neck and the body. It is a very important item covering strenght and stability. The body is tilted 4° backwards and 2° downwards according to the neck’s axis. This doesn’t make it more easy.
Day 21 & 22: Spending a whole day making a mould to be used for milling the joint.
Once this was ready, it was only “a piece of cake” to make the precise cut into the three bodies.