 A simple jig for cutting wide dados with a hand-held router. So how simple is this, folks? I mean, I started off with MDF, 3 eighths inch thick, and I cut two pieces 32 inches wide and 10 inches in depth. I then took two very straight pieces of red oak that, when I pushed them together, there was no gap, and when I put a level on them and checked them for flatness, I had no gaps, and I do that by shining a flashlight in the back. So I was happy with these two pieces. The bottom side had not been polyurethane, so I was able to glue that to these surfaces. So I glued these as perpendicular as I could. That's not overly critical. I then used the hand-held router to just run along these rails on each of these two separate pieces, and that would, of course, cut off the perfect width for that router with that bit. Now, it's only usable as a jig for that router base with that bit for these rails to be the perfect distance. So mark your jigs so you know what your setup is. If you throw a half inch bit in what's supposed to be a 3 eighths inch setup, then you're going to get, your things are not going to line up. All right, you can see the next piece, just a 3 quarter inch plywood, 10 inches long. Cut a slot in each of the two of them so that you can put a T-bolt through them and then use some wing nuts to secure them. Secure one end with screws, and I countersunk those. Make this as 90 degrees as you possibly can so that you know you've got 90 degrees here. And then that will give you a very nice alignment of all of these edges. You simply then adjust it to the width of the dado that you want. Normally you would take a workpiece and fix this down on a line, and then put a workpiece in there, push it together, tighten it up so it's the perfect size. I actually purposely undercut mine so that I can sneak up to my workpiece width so that things will fit very snugly. This does not require a router with bushings on it. I will give you a link to a video below if you want to do a build like this, but one that uses bushings on your router. And I hope you find that helpful. Small Workshop Guy, signing out.