I know this is really old, but what I found out for me was that the springs inside the lugs were rattling. What I did worked really well, and didn't affect the drum at all! All I did was take off the head, unscrew all the lugs that were rattling (basically all of them), and put about half a cotton ball in it. One ball is probably way too much. This worked for me because the rattling noise was the springs being out of place, and the were rubbing where they shouldn't have been
The cotton balls just kept them in place.
Another bonus is that is makes them easier to tune, because before they were moving a little bit, but now they don't
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