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The picture that looks like it has a cracked diaphragm is below the one showing the seam in the bell.It looks like it has a white line of light running across it,and it looks like a crack in the line of light,above and left of the screw.It could just be something stuck on it,with the picture making it look like a crack.I have a couple that look like that.The cracks never showed up until I took the diaphragms out and bent them by hand.Then the cracks jumped right out at me.Also,are you positive these are 6 volt horns?