| sometimes a fret buzz can be attributed to the string riding high on the tuners, if the a-string is wound so that the it comes off the tuner at the top then you might try to redo it.
on my cruddy instruments whenever that happens i take a very small piece of tissue or paper and put it under the string at the nut and it is usually more snug, this is not a good solution because 1.)it can make the string ride higher on the fretboard and 2.)because it is just a halfassed cheapo way to fix a simple problem. | 
