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This one works!! Tried it on some earlier occasions & got good results out of NAD CDPs & Marantz ones. The cloth made bag should be something like 2-in x 2-in and that will do. Additional bigger benefit comes from mass-loading the Top of the CDP with a marble/granite slab while that unit dispenses vibration via some decent cones (3 nos in a triangle).
Another cheap tweak is to put a childs' bicycle tube underneath the CDP unit, to take care of vibrations of the surface the CDP is resting on-Viren uses this & testifies to its effectivenss-anm may have noticed this.
But-CAUTION-one has to keep these kind of things within reason & not get obssessed, else very soon, the focus drifts away from listening to music to listening to the presence or absence of jitter etc.