Last fall, I was looking for a gift for my wife and came across the Secret Passageway Switch at Blight Designs (http://blightdesign.com/misc_book.html). Blight Designs was sold out, but I thought I could make something a bit simpler that didn't have to be screwed to the shelf or run a chain and string through the pages of the book.
This is what I came up with:
Step 1: Gathering parts and tools
13.5" or so of 1"x1/16" aluminum
1 Lutron lamp dimmer model #TT-300H-BL or equivalent
1 push button switch (I used a Philmore #30-003)
2 small zip ties (not pictured)
Some assorted shrink tube
2"x1"x1/16" adhesive backed neoprene (optional)
Drill with 1/8" and 15/64" bits (or whatever size you need for your zip ties and switch)
Center punch (not vital but it helps to keep the bits from walking in the soft aluminum, a nail and hammer will work too)
Soldering iron and solder
Something to heat the shrink tube (I used a mini torch)
Something to bend the aluminum (a bench vise works well)
Something to cut the aluminum to size (I used a band saw, but a hacksaw or tin snips work too)
Ok. Now we have that out of the way, on to the fun part . . . .