I have had this happen a few times when we were selling the low end light bars. What we did was drill it all the way through and JB weld a nut on the inside. A heli coil might work too. People like to crank these down when they don't have to be that tight.
That's why I went with rigid.If you got a problem they take care of it or replace it.Then some china clone.that takes a year to get warranty on.Plus my 40 rigid new was around $500.Not much more anways
You can say what you want about these cheaper LED bars. I have a 30" rigid on my maverick and these cheap lights can not compare on the light output and the pattern. I have a 20" Cree knock off on my truck and it's not much brighter than my headlights.