I figured this out while putting up a used baby crib for the umpteenth time. The hex screws weren't turning anymore, but replacement wasn't available in the local hardware store. Here is how to fix it
As you can see this was a hex bolt once, but the six inner edges are round now
The easy solution: Hit it with a hammer!
Do it on a flat metal surface like this anvil
Hit the same side until the bolt fits your open-end jaw spanner. Watch the video to see how easy this works
It' s hammer time !!!
You'll end up with your hex bolt looking like this
Fits my open-end jaw spanner
...works as intended!
If you have any questions or need more details, just post a comment. In case you like this idea, have a look at my other Snapguides: snapguide.com/martin-storbeck…