This is a concept for loose dovetail tenon/spline routing jig idea.

This is my design approach on a handheld homemade domino mortiser. I believe that with my design I have addressed everything you will ever want. Horizontal, vertical, and angle mortising. A more compact design. Mortises up to 50mm width. Angle and depth stops. Function for the mating mortise to be wider. Guide rod spring Indexing pins. Smooth action with linear guide rail bearing blogs. Excellent dust extraction.