I was re-installing my rear seat today when one of the smaller (rear-most) bolts broke off, leaving approximately 1/4" of the bolt still screwed into the chassis. Very little of the bolt is sticking out, probably not enough to grab even with needle-nose pliers. How do you remove the broken screw piece when this happens? I was thinking that a very small drillbit might help, but wanted to get more feedback before doing anything that could exacerbate the situation. Obviously I need this socket cleaned out so I can properly bolt the seat in. Thanks!