Heat and vibration can loosen bolts, requiring regular maintenance to retorque them. Unfortunately, retorquing often leads to overtorquing, and eventually to failure. To solve that problem, engineers ...

Often, the quick solution is to use lockwashers or thread-lock compounds. A more-permanent, less-costly solution from Balax Inc., North Lake, Wis. (www.balax.com), is to thread the hole with their ...