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With the aluminum centered and clamped onto the center of the jig using the large flat clamping block (A), the curved clamping plates (B) were used to smoothly draw the aluminum into the curved portions of the jig. A hardwood block (not shown) and a dead-blow hammer were used to smoothly bend the aluminum around the large recess curves to the corner of the cover. One of the smaller flat clamping bars (C) was used to hold the aluminum in place as it was hammered around the end corners. The end portions were then clamped to the jig. The bolt recess areas were formed using 1-inch-od aluminum tubing with 1/8-inch wall thickness.