I bought an iphone from a guy that was supposed to just need restore. Turns out the top button doesnt wanna work, so i cant put into dfu mode. I have another motherboard so i thought id just switch em out. Problem is, one of the bottom two bolts thats holds LCD assembly is stripped out. Any chance i may be able to drill it out? If so what size bolt is it, so i can buy the drill bit. I have been to some hardware stores and they sell really tiny drillbits so i just need to know the bolt diameter...any help is appreciated. thanks