I've got a lawnboy commercial gas mower that's about 20 years old now. It has a magnesium deck, it needs virtually zero maintenance, and is so light that there is absolutely no need for it to be self propelled. No problems starting it, even after sitting in the cold shed all winter.
Lawn boy doesn't even make a magnesium deck mower any more. The aluminum ones would have to be at least a couple of pounds heavier.
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