"easy outs" have a couple of different designs, generally have a reverse thread and are conical, so as you drive them CCW into the bolt head they turn the bolt out. The trick IMO is to use an impact driver, it seats the easy-out into the bolt at the same time as the shock helps to break friction, and a little pressure to unload the threads and reduce the friction. I've never had any luck with easy-outs until I started using the impact driver.

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Gone to the dark side

- Jeff