++++ " Even seems to me that my SP-10s and Denon's could perform even better with out its metal bottom cover. I don't try it yet but maybe is time to make this test and see what happen. " +++++
Regards and enjoy the music,
raul.
Mike is not suggesting running the Technics MK 3 nude. His comment does not support what you've been pressing since the beginning of this thread.
One Technics MK3 renovation by Dobbins removes the MK3 top cover with speed switches (which is often damaged) and puts the rest of the table into his heavy plinth. Speed change is still accomplished at the motor controller.
I leave the cover and switches and support the entire works with a heavy brass rod attached to an iron block fastened to the chassis with stainless steel. This mechanism locks down any vertical movement and flex while absorbing motor vibration.
I have no doubt Steve has addressed this problem in another way and gets excellent results. With either method, both of us and most others such as the famous original constrained layer MK3 plinth by Akito Knita rely on multi laminations, mass and constrained layers to bring out the best performance of these powerful tables.