ld wrote:Why one side ?
This is my concern, could it be to do with bias setting?
I doubt the pattern on one side relates to antiskate. The stylus sits pretty much like a vertical pin in the way it presents to small particles, even if the cantilever were not dead aligned with the groove, it stays vertical.
Perhaps the air just above the record rotates in a slight vortex, and makes for a bias in particles which are thrown up randomly ? Or perhaps the stylus itself creates a small vortex in front of the pole piece ?
I suspect BA will have seen such things when it comes to dismantling and repairing carts if it's at all common ?