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Originally Posted by DG
The logic of this escapes me.
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Mask frames are heat treated metal, designed to absorb shock and rebound. An impact with sufficient energy to bend the frame has weakened the metal. Bending it back will further weaken the bar, putting in jeopardy of failing if hit with sufficient impact again in the same area.
Think of bending an aluminum can tab back and forth. It weakens more with each bend, finally breaking. mask frames are more brittle from the heat treating.