Thumb rings (archery) - primitive experiments - part 1

[2011-03-01] I’ve been trying to make a perfect primitive thumb ring for some time now. And I made a rather efficient one, but I lost it some month ago. Trying to replace it, I made several new ones, but I have still to try them in real conditions. Before I also lose them ... or before they get destroyed by too many “improvements“... let’s “save“ them here, electronically, in a video. I’ll record their efficacy in another video. [[ update 2014 : I tested those thumb rings ... and none were efficient.