Hello, I'm pretty new to bass and am in need of help. I don't really know the nomenclature of the bass, so excuse my ignorance. I bought a bass from walmart. I know, not the best quality, but I figured it'd be something to learn on until I could afford a good one. Well, when I brought it home, I was tuning it, and broke the "A" string. I was aggravated, but I still wanted to play the bass so I just took off the string and played the bass with only the E, D and G. This was about a month ago. A few days ago, I finally was able to get a new A string. I strung it, but the problem is that I can only tune it to an F# or maybe even a G. After that, the string won't tighten anymore. If I continue to try to tighten it, the piece that the string coils around at the head of the bass pops and the string is much looser. I don't know what exactly is the problem or what I can do. I don't have any money, so if anyone could tell me a cheap way to fix this or even anyway to take care of it, I would be extremely grateful. Thank you very much.