I am making a picnic basket out of Ash and I have several joints to make and a loose tendon joint is the only was I can figure to do it. The loose tendon is 1/4" T X 3/4" wide and 3/4" deep. The Ash is 1/2" T X 1 1/4" wide and the mortise needs to go in the end. I have been putting the mortise in the edges using a 1/4" spiral bit in my router table. Putting a mortise in the end seems a little scary to me. I sure could use some help.