This brilliant but challenging joint is the wedged blind tenon, also known as the fox tenon because the two wedges look like ears. The blind tenon goes into a tapered mortise, and as it is driven in, the back of the mortise pushes the two wedges into kerfs in the tenon, splitting it apart to create a captured dovetail that will never come out. This joint holds permanently and does not require glue.
Wedged Blind Tenon Joint (Fox Tenon) Plans
