Maybe I'm just a moron but I have a question for you guys about something that everyone else probably knows how to do. When I buy strings to put on my ergodyne, I can't figure out how to do it. So I take it to my local music store and they put it on for me. BUT, when I get it back, where the strings get close to the pegs, they put this black stuff on it and it seems to make it work better. When I buy the strings, that stuff isn't with it. What do I do to get that. (I hope you guys understand what I'm talking about).