Some say this individual, is the Godfather of Isolation Ideas, even the earliest Townshend designs are claimed to be versions of this guy's proposals.
Worth a Read, and the Ball and Spoon works to certain degree in all the guises seen.
Quite a few years ago I was to experience the Ball and Spoon and a selection of variants of the method, all will impact on the sonic, Metal on Metal is cheap and very good starting place.
Not that I have tried it, but today, I will suggest Densified Wood on Densified Wood will be a very interesting footer.
Some versions seen today of the Ball and Spoon method are the best part of a $100.