Seems every so often I'm making a hitch insert for one purpose or another. So I decided to make this jig to pilot the pin hole in the center of the 2" square tubing. I needed to make a couple inserts with clevises on them for the grass fire rigs, took just about half hour to lay out and make the jig; but now I can set up to drill the pin hole in a couple minutes. Note the bolt to push the tubing into the corner and secure it. You have to compensate for the slight centerline offset in your layout. And if your tubing has a pronounced weld inside, put it away from the corner you push in to.