When I used to own a MMF5, I did exactly the same as Dan_ed (above). I got my cork from OfficeDepot - 1/8th inch thick. If you do the conversion, this xlates to 3.25mm thick, which is almost exactly the thickness of the factory felt mat. This meant that I did not have to change the VTA (thank God!). The cork mat did not degrade the sound & I was able to forget about static charge build-up on the LP. Works great & is cheap!