
Machinists call it Prussian Blue ......... Jet Eng. Mechs call it Blue Dykem !



With that said I was looking at your pictures and it looks like you created your hole with the grain that looks to me would be the weak point and allow it to fail again. I have circled some of the grain marks that I think will give you problems. Way more grain marks than I can mark.
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Twas the sun-filled night, of a star filled day, when 2 dead boys went out to play, .. back to back, they faced each other, drew their swords and shot each other.
Ya'll KWITCHER*****IN, and enjoy a marvelous piece of machinery !!
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Is that your T bucket, what year is the body ?
pep