Keithro
Can you countersink it from the top down and use a flat head screw the the support bar with a lock nut underneath?
Actually that is how it is attached I have several (19) to be exact. I am using steal flat head cap screws. When the rack was built we installed the threaded inserts all over the place. My problem is if I expand the slots to allow for the expansion of the King Starlite XL I am afraid that the cap screws might pull out. There for I would need to use a large fender washer and a regular bolt that would not be flush with the surface.
Expanding on this further because you asked about the rack. My first two racks I used 1 1/8 tubing for the cross members. This allowed me to use Yakima Quick clips which just snapped onto the bar. I used 5 of them to attach the aluminum piece on my 03 Rubicon. This worked Great!! Well when I started building this rack I thought 1 1/8 was going to look to small with the overall length of the rack. So I incorporated the weld in nuts. Now I wish I had just add a few tabs so I could thru bolt anything I wanted to put on top. I am actually contemplating welding a few tabs on to the top to try this out.
Well a long reply but hopefully this helps.
Also -- Try out the rack pad it works well. You just need to take up the air space between the rack and the vehicle. If you are coming to OvExpo my Jeep will be there. You are more than welcome to check it out in person.
03 Rubicon with the Aluminum top panel.
Here is a shot of the Yakima Quick Clip that I used to attach the aluminum.
Man I miss this Jeep. Here is one more out in Anza Borrego.