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"  Lockwashers don&amp;#039;t work in cars. Period. The only way you can keep a bolt from coming loose is by using either a threadlocking compound or a positive locking device (such as a cotter pin). (Photo by Burcu Avsar) I have this really nice bike rack that attaches to my trailer hitch receiver. I have to dismantle the rack to get it into my apartment and put it away, which is easy. What&amp;#039;s hard is keeping it from dismantling itself on long trips. How can I keep the bolts from getting loose if they are threaded into holes and there is no locknut I can replace? Lockwashers just shave the aluminum off the rack and come loose. I would use some threadlocker, either a liquid or gel. This goo is an anaerobic compound. It flows in the presence of air, but when you spread it onto the threads of a fastener and tighten down, oxygen can&amp;#039;t get to it. The threadlocker then polymerizes and effectively keeps the fastener from turning. There are quality products from several manufacturers. They come in dropper bottles, lipstick-like tubes and gel-dispensing tubes. You&amp;#039;ll want to get blue compound, which is the industry standard for a medium-strength product. (Red threadlocker is intended for fasteners that normally aren&amp;#039;t removed without the application of heat and a large amount of torque.) Start with a clean set of threads, both male and female. Use mineral spirits, or carb or brake cleaner. There is also an aerosol spray cleaner/primer that will shorten the setting time, as well as clean the threads. Add enough threadlocker to the joint to wet the threads (usually a single drop is sufficient), then tighten normally. To remove the fastener, simply unthread it. You&amp;#039;ll feel a fair amount of initial resistance, and then the pieces will come apart easily. Clean and reapply every time the parts are assembled. Don&amp;#039;t touch the bolt to the dispensing nipple on the container or you&amp;#039;ll transfer metal ions to the plastic. That contamination will eventually render the entire vial of threadlocker useless. "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.popularmechanics.com/cars/how-to/a1172/4208687/>