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8161
If a streamline cover plate is to be hand formed using a form block, a piece of dead soft aluminum should first be placed over the hollow portion of the mold and securely fastened in place. The bumping operation should be
| | A) started by tapping the aluminum in the center until it touches the bottom of the mold and then working out in all directions. |
| | B) distributed evenly over the face of the aluminum at all times rather than being started at the edges or center. |
| | C) started by tapping the aluminum lightly around the edges and gradually working down into the center. |
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