First, here's a little video I put together which should describe the issue.Anyway, I run 2 SL-1200s for my DJ setup. One is a MK2, one is an M3D. the M3D is the one with a problem. The tonearm moves in this manner without any outsides forces acting on it, such as record force or anti skate:At tonearm rest: movement toward centerAt absolute edge of platter: no movement (as it should be)At midway down the platter: movement towards outside of platter (as though there was a high anti skate acting on it)At 3/4ths down the platter: no movementAt more than 3/4ths down the platter: movement inward towards the centerAnyone have any ideas what might be causing this? It does it regardless of stylus, cartridge, headshell, orientation, etc.