I think the design of the mirrors is a good example of how neurotic Honda engineers are. They are designed so that either direction something collides with the mirror the mirror can get knocked loose rather than breaking--or worse--knocking the direction of the steering off and causing an accident. Seems like a good thought but makes it more painful for us backyard mechanics.
Teksi, the bottom bolt is actually an adapter that screws into the handlebar like a normal nut. The mirror then screws into the adapter "backwards", it has a reverse threaded stem that goes into the adapter.
The upper bolt is then used to tighten the mirror onto the adapter. This bolt thread is also reversed, so you have to turn the upper bolt clockwise to loosen it.
All in all three parts, from top to bottom:
1. a mirror with reverse threaded stem
2. a reverse bolt, and a
3. an adapter that switches the reverse thread input into normal thread output.
Glad the last post was helpful for you, motorwerks!