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I had this with a brake disk (my forge is considerably smaller - next one will be a drum!) - I used cheap rods from screwfix - had a few fails so I whacked the amperage up to max, took it real slow and made sure I was burning it in hot and deep to the cast. It's not great, it's not pretty, but it works!
Wonder if it would work with multiple parallel blades to split a bunch of kindling at a time
3D Aquarium Background