Hello, im stuck. was service the old bike, tightening brake bolt back up on four bolt mounts and one snapped. there is about 3/4mm sticking out of frame. any good idea to get it out, threads should be okay so drilling is a last resort. ive tried plyers, an cut abit into the top of remaining bolt to use screw driver, neither worked. any ideas would be great, heating maybe?? not sure cheers, Tim.