Improved Anti-Vibration Foot

This is a vastly improved design of anti-vibration foot over my previous design - http://www.thingiverse.com/thing:691234.
It is partially inspired by 3DMS' tennis ball damper - http://www.thingiverse.com/thing:1209709.
The solid foam-rubber balls provide total vibration isolation from the workbench and I have been using this for several months now with no loss of resilience, unlike my earlier foam 'noodle' feet. These will fit any printer with similar 5mm plate construction to the Wanhao or