Having lived through two D120s each losing a bottom foot, I now have the four feet resting on self-adhesive furniture felt pads (felt side up) until I find a more permanent solution such as Herbie's Tenderfeet, Vibrapods or the more exotic stuff like Solid Tech's Feet Of Silence.
Naim NAC-N 272 ➣ Naim XPSDR ➣ Naim NAP 200DR ➣ Kudos Super 10 ➣ Siltech Explorer 90L (Montreal, CA)