Bolt on motorcycle mirror?

The mirrors on my motorcycle has a single bolt that goes from the mounting bracket through the end of the mirror to secure it to the bike. It threads through, and when it's tight all's good. But if I were to fold down the mirror then I end up having to get an Allen wrench to make it tight or the mirror... show more The mirrors on my motorcycle has a single bolt that goes from the mounting bracket through the end of the mirror to secure it to the bike. It threads through, and when it's tight all's good. But if I were to fold down the mirror then I end up having to get an Allen wrench to make it tight or the mirror won't stay up. What would be the best way the secure the mirror but still be able to fold down when necessary without having to find a wrench?
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