I think the nylon parts are designed as consumables to prevent damaging the index rod. They are cheap and look easy to replace. Order a few extra- like shear pins.
Has Lee changed the “Square Ratchet (3567) and Auto Index Clamp (3566) over the years. I ordered new # 3567 square ratchets for my Classic Turret press, and the square ratchet is bigger than the original ratchet that came with the press. Do I need to order a new Auto Index Clamp that will seat the larger square ratchets ? Any help will be appreciated. Arthur.