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This is just something I felt like doing with the bottoms of the Aluminium Red Bull cans I used to make my RedBull Extra 330s Instructable;

http://www.instructables.com/id/RedBull-Extra-330S-From-RedBull-cans/


For this instructable you will need:
A Red Bull can or just can bottom
Tin Snips or Scissors
Pliers (Preferably long-nosed pliers)
Like 3 minutes...
 
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Step 1: Cut the bottom end off of a can

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To cut cans, I use tin snips and basically start cutting from the hole in the top of the can, down the side in front of it, then across around the bottom outer rim. To trim this "cap" to the right size and shape use the same cutting tool to gradually reduce the "lip" to about 3mm from where the bottom-most rim of the can is to the edge.

Further trim this edge so that the circle is even all the way round. This will keep the disk balanced.

Step 2: Bend the edges

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Sorry for the blurry photos, my camera does this a lot with even a little bit of motion.

Bend the edge down so that it follows the curvature of the dome. Once you have done this, bend it more inward " <__> "

Then, simply clamp the edge down to touch dome. Follow this through evenly for the entire rim. Fix any "unbalanced looking" edges so that the finished product is as circular as possible.
Neat!
Pro

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