Ciao Luca, glad you could source compliant pads... the factory must have had some remanents from old stock. They no longer use sorbotane pads for current products. The last product I have seen shipped with sorbotane pads was the M312 Since then, for heavier amplifiers they utilize bolt-on Delrin balls. Not sure what material is now being used under lighter devices like preamps.
Saluti, Guido
Saluti, Guido