Spring fasteners hold not what you hoped for

The curl bar itself is not objectionable.

But the problem is that the spring-locks allow (by their very nature) is not 100% attachment of the weight, which is why the weight mitrollt while exercising and free play has. I used the curl bar with 2x 10 kg discs. However, the spring latches are still the better alternative to the star closure, as they remain in place at least.