I drilled 2 large holes for mounting a flat screen in the bedroom. One hole is in a wood stud and the other is a metal stud. I will be renting out our apartment and will be taking the TV down and filling the holes and repainting walls. If I ever plan to move back into this apartment and mount a TV again in the same spot, how do I avoid not drilling in the same exact spot? Basically, I don't want to hit a portion of the same hole and create an even larger hole, making it very unsafe to mount a TV. Is there a way to mark the spot so that I know to avoid it in the future?