I found the blade to the Big Snapper Mower while cleaning out the barn. The previous owner had modified a leaf spring to use as a blade. I cannot imagine how unbalanced and noisy that thing must have been.
I am no longer surprised by these type of “engineered” fixes on the farm. My guess is that there was not a whole lot of money, so they saved where they could. Needless to say, I will not be using this blade on my mower.