You could barely see the jack nut. Point of the picture is to show what I had to drill thru to get my bolts thru. And initially the plan was just to add washers and nuts but there was no way to do so.
you can also see why I dont have full faith in them. Jack nut they supply spiders out as you tighten it down. I practiced a few times (gobi supplies you with a few extras and a piece of steel) and the magic number was 8 revolutions for a perfect fit before you damage it. Even with all that practice ..... look at the "spider", it already had started pulling itself out a bit. No way that was going to hold up to what I wanted to to do. Now, for those adding a rack to run around town, I think this would be just fine. For those who like to bang around, I call FAILURE>