For those that are interested:
1) Drilling was not an option at all.
2) I figured out myself how to remove the head liner. Total waste of time! the roof is double layers of steel. So, even after removing the headliner, I could not get to the otherside of the RivNuts!
3) The olny way I was able to remove the light bar was to jam a screw driver down and pry on the RivNut, while trying to remove the bolts. This process took longer than it tok to install the entire assembly!
The problem was caused by the sealant I used on the RivNut was not as strong as the white bonding material that is pre applied to the bolts. I think it is nylon.
I tried to thghten the RivNuts more, but I know I will run into this again, when I need to replace the lamps. I hope it is not for a long time. I have caused enough damage already.
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