Step 1:Preparation Use the guillotine to cut the aluminium sheet to the size what you want. Step 2: Use the cylindrical wood as template to bend the aluminum sheet, give it a initial circular shape. Step 3: Use round plastic hammer to hit the mid part of the sheet, shape it to a concave shape (hit the sheet uniformly, keep the curving shape of the sheet.) Keep hitting until the whole mid part of sheet is concave (shows in next picture) Step 4: This is the time to make the two sides of sheet concave. First, use hammer to hit the side of this curve part, make it curve upward. ( use hand to hold the sheet stand, this will be easy to concave this part) Give an initial curve shape of the sheet and do next step. Step 5: Refine the reverse curve. After defined all the parts of the sheet, use a polishing hammer with a rounds metal stand to make the curve part more accurate and smooth. C arefully stretch and shape the metal, to stretch this eleme
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