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Here's the scoop on the MM875: it has a plastic piece called a "blade insulator" (part # 241381-01) that "locks" the shaft to the blade, so that you can remove the nut by stopping or blocking the blade. If it has been damaged or stripped out, then stopping the blade won't do anything. However, the metal spacer directly under the nut IS still locked to the shaft (because of its shape), so you can use a pipe wrench or something to hold that in place and unscrew the nut. You might even be able to get someone in a home improvement store to do this for you. But you will still need to replace the insulator, which is only a few dollars.
Funny, I came here because I just opened up the switch case on my MM875. Hold the switch so the terminals are on top. Call the black switch (the part you push in to power up the mower) north. The north post gets white (metal connector). The west post gets red (plastic connector). The east post gets the black that comes from the mower's motor (plastic connector). The south post gets the black that comes from the outlet (metal connector) (Black Plastic Switch) White (Metal) Red (Plastic) Black (Plastic--from motor)) Black (Metal--from outlet)
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