I had to straighten some of the front shields on my 105 howitzer due to rollover damage when they were in service. They will often have those hammering marks as well. The press will only go so far before you hear a "crack", and sure enoguh, there will be a crack in the armour. I ended up heating them red to bend them straight, likely destroying the temper on the hard side. If there is ever a next time I'll try the hammering method.
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