Installing Flash on 64-bit Linux (Centos 5)

This took a fair bit of searching, and the answer’s non-obvious…
Everybody (?) knows that in theory, if you have 64-bit Firefox on 64-bit Linux (x86_64), you can use nspluginwrapper to install 32-bit plugins, like the Flash Player. There’s some instructions here for example.
However, those instructions are flawed in two regards.

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