http://i527.photobucket.com/albums/c.../moomba025.jpg
monster tower racks swung in under the bimini and speakers, you can see the lever that is used to release to rotate on the right rack
http://i527.photobucket.com/albums/c.../moomba017.jpg
side shot showing the hardware a little, these can be mounted on any part of the down tube-fully adjustabe
hope it helps