I actually made a home video (VHS) for a buddy of mine who wanted to learn to serve. There are a couple good methods used to tie off, which is just as important as keeping the serving bobbin tight. It's not hard to do really, just remember to keep the bow string from turning while you apply the serving material. Ya know, I may have a hand drawn step by step sketch around here that I did for someone else too... maybe I could just email that to you.