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With the first repair pattern made and transferred to a piece of sheetmetal, I then used the Eastwood shear to trim the piece to shape. You will want to use metal that is similar in size to the original thickness. On older cars you can use 18- to 22-gauge steel. I used 20-gauge steel for these patch panels. I find 20-gauge to be thick enough to weld and shape easily. Using the shear and following along the line made the shaping of the patch panel easy.