Comment on Yarn Tail Tutorial (Feline) by WarmSummerSun

I was wondering if you know a way to tie the fluffs to the core good enough so they won't come off because I want to start making yarn tails and I want to make one for a friend that lives really far away and I'd feel horrible if it fell apart after a few times of using it. And I don't know how to thread the fluffs through and was wondering if you knew another way.