A graviton stabilizer was a component in the artificial gravity generator. This stabilizer modulated the level of gravity produced, and if it failed, it could pull too hard and make a person feel ten kilograms heavier.
Fortunately, the USS Sentinel visited Deep Space 9 during that three day window, and they had a surplus graviton stabilizer. Nog procured this in a series of trades. (DS9: "Treachery, Faith and the Great River")