Thanks for posting those.
--------Critical Evaluation -----
• “Strong Felx door…” This is free from pay-for-services folks, and this looks like the mechanical basis for their pay carabiner designs, which have more pretty designs and textures added, etc.
Strength: Unknown (but small lip probably limits strength)
Cool factor: ~4 It’s pretty ugly, but one might add texture.
Simple Carabiner Dhapro - very similar to above, Even smaller lip so probably not strong.
Carabiner Rev 2:
Downloadable : YES.
Strength: Unknown (closure lip limits)
Cool Factor: ~ 5.5
This is interesting because spring is mechanically de-coupled from hinge.
None of these look as good as the one in the video.
The all studiously avoid videos of being used in normal situations.
Thanks again for posting.