Kirby Belt Lifter Assembly

Question

How does the belt lifter go together on the Kirby vacuum head?  I broke the outside  plastic piece which turns to lift the belt on and off.  I have repaired that piece but am not sure where  the plastic washer and the two metal washers go when putting it back together.  I think the plastic washer goes inside of the  vacuum head with the two tabs facing outward towards the front of the vacuum head but I don't know how the wavy metal washer and the flat metal washer fit together or if they should go inside the vacuum head or outside of the vacuum head.Thanks for any assistance you can provide.