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Here are some of the tools and supplies you'll need for a job like this. We grabbed some remnant 3-inch tubing and sheet aluminum from the remnant bins at M&K Metals in Gardena, California. Left over from previously cut sections, scrap aluminum is available by the pound at discounted prices. This is 6061-T6 aluminum, which is overkill for this application-we could just as easily have used 3003, but the 6061 is what was available in the size and shape we needed.