If it is sitting atop a rack then try a set of Nobsound springs. Only $30 and you won't believe the improvement!
Nobsound come with 7 springs per corner. Usually a turntable will only need 2 to 4. This leaves you with a lot of spare springs. Drill 1/4" holes in some wood or MDF and you can make more. This way you can do 2 components for $30, an unbeatable bargain!