The forward flap pulleys see asymmetric wear because of the cable angles; the left pulley more wear than the right, for some reason. At last years condition inspection, I'd flipped the left pulley over, but left the right one alone. You can see the amount of wear involved on the right pulley below. The left pulley was similarly worn on both sides. I replaced them both with AN210-3A's from RANS, which was the least expensive I could find online ($14.15 each).