Hi, I just restored a sl1300 to its former glory as an upgrade from my D2. Funny thing is, it doesn't seam like an upgrade at all. I replaced the D2 with the 1300 in exactly the same setup, even switched headshells. The 1300 starts to rumble at volume above 1/4 the D2 did not ever rumble at any volume. When I lift the 1300 (heavy!) while playing the rumble disappears. What can I do? It's the first table to rumble in this setup and by far the most sophisticated one.