here you go: www.thingiverse.com/thing:6595547 Likely a old version with 0.4mm clearance that does work. If not message me and I could send you a later revision with 0.23mm that definitly works.

How does it work?

one direction: pretty obvious the spring bends out, the teeth pass through the other direction: the spring gets slightly pulled/stretched (the leading tip of the teeth pushes it) which causes the tip to be pushed against the block (left in the picture) and blocking the mechanism.

In other words, this mechanism works by having a physical path for the compression of the spring but in the opposite direction when would need to stretch to move pass the teeth it is stopped by a wall/block.