Consider this Times New Roman “O.” Despite links and anchors to align the symmetrical shape, the results need improvement:
After grid fitting, the “O” still has two “knees.”
A delta of 1/8 pixel to the left eliminates the top knee:
After a 1/8-pixel delta at the top right.
A second delta of 1/8-pixel to the right corrects the second knee:
After a second 1/8 pixel at the bottom left.