OK, I have had my off road lights installed for a while. No problems. Today I decided to replace the lamps with a whiter, brighter lamp. I hate the fact that you have to remove the entire light bar to replace the lamps. I came across a serious problem! The bolts that hold the bar on will not come out!

They just turn, but won't come out. I assume the "rivnuts" are just turnung underneith.
Did I not tighten the "Rivnuts" enough when I installed them?
How do I resolve this problem?!