This is my Tenon Router I use when finishing tenons on dimensioned lumber. Its a very easy way to get a tenon surface flat and parallel with the main body of the piece. You can work a long tenon quite easily and accurately also.
parts view. (quarter is for size comparison)
bottom view.
In use view.
I use it by holding the long side in a more or less fixed position and moving the left side back and forth to slice the tenon to size. The skew angle cutter works well across the grain. Its very easy to tap the cutter down and slice just a wee bit off the tenon. It also works very well for wide dado cuts when undercutting for lap joints in the middle of a board.