lewm
When the stylus is riding in the outer grooves moving toward the one instant when it is tangent to the groove, the tracking angle error is getting narrower until it disappears momentarily at the point of tangency. Then the stylus keeps on riding toward the inner grooves, which is opening up the tracking angle error in a different direction until it reaches another maximum at the innermost groove. This would also change the direction of the skating force.No, this is mistaken. Skating force is mostly a function of VTF and offset, not groove radius. The force doesn't change direction, but is always pulling the cartridge towards the center of the disc.