This is the tutorial I used for the two color. I have the same problem, I have to melt it several times and it still came out. I have tried putting glue on one end and shoving into the other end, then melting the edges. That worked but it was difficult. I do put in several stitches after I melt the edges just to really secure it. I am going to try my woodburner to see how that works. You do have to take about 2" out of the cord before putting the other end in...this really gets it in there.