To make these beads, I followed a tutorial that you can find here.
I followed a tutorial by Cut Out + Keep to make the sliding closure. I used wooden beads and a faux-leather cord. The tutorial calls for nail polish at the first and the last knots of the closure. I applied it liberally all over the sliding closure to make sure it doesn’t come off. I even threaded the cord through the knots before cutting the ends (before brushing the nail polish). Better be safe, no?