Step 1: What you will need
1. A glass cutter (commonly used for stained glass). I already had one but you can get it for $4
2. 1/4" x 6" x 3' pine board $3 each (buy two) or one 4' length if you can find it
3. 5/16" glvanized wire rope clip $0.88 each (buy two)
4. Wood glue (I like Titebond II, $3 for 4 oz)
5. optional 5/16" washers $0.08 each
Total cost: about $12 if you already own the glue
Total time: 1 hour of Making time + 2 hours waiting for glue to dry.
Tools: I don't have a garage in San Francisco, so I made this at the Techshop (SF) where I used a bandsaw, clamps and belt sander (optional).
Step 2: Cut things
2. In two of these 8" pieces, cut a v-shape (right triangle) at one end. Make these identical. The v shape should be big enough to accomodate at least half the diameter of your wine bottle.
I used a bandsaw because it is so fast and easy and precision is not important here. As a wise man once said, "don't let your project turn into an anal-retentive-neurotic-nightmare". Ok, he said this about making beer but I like to keep it in mind pretty much all the time.
3. Use your wine bottle to mark approximately where it contacts your v-shape.