The end of the wire that goes inside the barrel can be secured by tying it in a knot or, simply, bending a small number of folds. This way, the grommet can turn freely inside the barrel clasp (which facilitates fastening the bracelet on the wrist).
The other end of the wire is shaped into a (single or double) loop, some five or six mm in diameter. At the closure of the loop, the wire is wound once or twice around the "stem" which exits the barrel.By the way, i am only glad to report that the bracelets have been a success - demand keeps rising!