Crimp-end findings may be appropriate for very thin braids and they are used in conjunction with jump rings and a clasp, similar to end caps with loops. Different styles of crimp-end findings are available but the concept is the same — you insert the cord, and then compress a portion of the finding to clamp the cord in place.
To use one, bind or seal your braid, apply a bit of two-part epoxy to the end of the braid, and insert it into the crimp-end finding. Use pliers to squeeze the finding as dictated by the design of the finding.
In photo a, the center of the finding features a slim band of metal that gets compressed.
In photo b, four pronged “petals” get squeezed together to clamp the braid.