Thanks, I've seen both knitted and crocheted earplugs and loved them but I can't knit or crochet so had a go at this.
wicket-poo, yes my earplugs have the split, I used the whole floss bundle and pulled out a length of the whole cord from end to end then added approximately 6-7 times the length of the cord from the start of the split to the earbud. I tied the floss leaving the length next to the cord and started knotting over both the cord and floss. I ended up using 2 8m embroidery floss bundles for this, when I was about to run out I just tied the new bundle over the 2 bundles and cord, after a few knots I trimmed off the short floss and continued knotting as normal.
Here is a basic visual explanation, not sure if my instructions are overly clear lol.