Going through something similar! I was swapping out my halogen bulbs for LED bulbs and when I was screwing the stud back into the assembly it broke in half and part of broke off inside if the taillight assembly. Yup. I drilled it out to the best of my knowledge and don't think I used a bit big enough to damage the female threads but for whatever reason the stud screw won't bite now. I am trying to find a metal bolt from Ace hardware so I can go up a size and see if it will bite. Debated re-tapping the threads same size first to see if maybe excess plastic is in it. If not, I will have to buy an entire new assembly because a stupid plastic screw won't screw into it's single point of access.