Very interesting how the break is so clean and lines up with the cylinder.
The left shell front tab looks like it pushes against the right shell front tab groove. I wonder if the right side was not only taking stress on its side but also stress from the left side shell when the left tab pushes against it.
I also wonder if the shell peices had interlocking tabs if the stress would be distruibed more evenly and less likely to break.
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