The extractor simply slides out the side of the bolt head. Although you can't see it, there is a dimple cut out on the underside where the ball applies some pressure. I just use a small screwdriver/hex key to push it out. But you might want to do it in a plastic bag as the ball will can come flying out once it's free. I then use a magnetic flat tipped bit on a handle to push the ball back down as I slide the extractor back in.
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