Screw extractors work best on screws with stripped threads and/or broken heads. [4] X Expert Source Gino ColucciHome Improvement Specialist Expert Interview. 14 January 2021.
If it doesn’t work, try tapping the extractor in harder, or apply a lubricant like Liquid Wrench to the screw. Let the lubricant sit for 30 minutes before trying to remove the screw.
If it doesn’t turn on the first try, move on to the next size. You don’t want to further damage the screw head.
