Projector feet

I installed my LCD projector on a shelf permanently and wanted to make sure it wouldn't fall. I made this little thing that allows me to tie the projector to the shelf.

The mechanism enables small adjustments of the relative position between the screw that ties the feet to the shelf and the screw that holds the foot to the projector. This is not meant to deliver much force, don't hang your projector from the ceiling using these feet! This is just to keep the projector from moving sideways.