I have the Leigh D4r Dovetail jig. With it I ourchased the M2 Multiple Mortise and Tenon Attachment and have not used it yet. From watching the video from Leigh, it appears that the tennons are round on one side (the front side of the tennon when in the jig) and square on the back side when cut on the jig. Then in the next picture they show them being put into the mortises rouded on both sides. How are they cutting the tennons rounded on the back side when in the jig? If the tennons were spaced symetrically, I suppose you could flip the board around and recut the back side.... now placed on the front. They wold have to be precisely symetrical. Or how would you cut them if not symetrical??? Anyone have any experience with this jig? To furhter explain, If you look at the below pictures closely, the tennons are rounded on all 4 corners in the top picture, however in the bottom on the jig they are square on the back 2 corners when being cut. You have to click on the link to the bottom picture to expand it to see what I mean.