I bought a uke a while back from an estate sale. The strings were a little thick for my liking, but I used it for a year and decided to change the strings yesterday to Worth clears. It’s a KoAloha concert. Everything was going well until I got to the A string. Seems the slot in the nut is too large and the string is hitting bottom and buzzing. I tried to put a small piece of string under it and no luck. So I wound it around the outside of the tuning peg and it pulled it against the side of the nut. It seemed to work but it still sounds a little off? Is there a way to fix the nut or should I replace it? Not sure if it’s glued in place. The uke was built in 2002.Thanks.