As far as plinth mods, I've been considering applying Dynamat Extreme (or its cheaper B-Quiet clone) to the underside and sides of the wooden plinth, the thin base plate, under the top metal deck and the speed control cover, as well as some on the top of motor's brass mounting plate. BTW, I was goofing with mine the other day with a stethoscope with the drive belt removed so I could also check for noise coming through the stationary platter. The sound of the motor was barely audible (in decreasing order) on the speed control cover, wooden plinth, metal deck, bare platter, tonearm. It was not audible on top of the stock platter mat.
I had also thought of putting Dynamat under the platter, but it might mess with its balance. Also, no noise made it through the platter mat anyway (this will be even more the case with all the Dynamat elsewhere). As for feet, I was thinking of simply using some archery field points. They can be screwed in and out for leveling and will fit, both physically and aesthetically, into where the stock feet are (with slightly enlarged whole). Larger spikes would look silly, IMHO.
