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I believe that the wide prong on the polarized plug is connected to the cold, or low side of the line, so that's the one to set up to go to the chassis.
However, having said that, you can't trust that your outlets have been wired correctly, so it's still dangerous.
I have pondered this situation for years and have not found a satisfactory solution, short of using an isolation transformer. However, that isn't so hard to cobble up from a pair of filament transformers back to back. You only need, for most of these little sets, 20 Watts or so, which can be gotten from a pair of 6.3 V 3 A transformers.
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