Spring washers have to be renewed after the old one has been released. They are a way of locking the bolt or crew into position, the 'spring' stopping the fastener coming loose with high frequency vibration. Once used the spring is lost and reusing an old one is effectively useless.
More sizes of spring washers you may wish to add to yuor shopping cart:
A component that has to be replaced when once the old one is removed.
Add as many items as you wish to your shopping cart, a selection of spring washers for example, and still only pay the same single fixed price shipping cost.