Loose bolt on stem, replace? My stem is secured to the steerer with two bolts. One bolt is strong. The other is loose. Replacing the bolt wont fix it, because the material around the bolt is not that strong anymore (small pieces coming out). Pls see attached screenshot.

How can I fix that? Is it secure?
Having just one bolt to bear the load isn't enough. The main good option would be to replace the stem. It's chunky so helicoiling would likely also be fine if you found a shop to do it cheaply enough.