It's always important to check leaf springs and their accessories for wear -- a worn or cracked leaf spring can cause untold damage to a trailer and its contents. When taking leaf springs off, it's a good idea to check the shackle links for wear. A round ring of wear that matches the shape of the nut is OK, but once the shape becomes an oval, it's time to replace the shackle link. <a href="http://auto.howstuffworks.com/auto-parts/towing/equipment/accessories/leaf-springs.htm">How Leaf Springs Work</a>
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