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The only usable are (so far, I'm still playing) the red big valve wheels. That's true that there some red big unusable ones, but not quite many.
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I haven't spotted any non-interactive red wheels. In fact the distinction between interactive and non-interactive objects has been readily apparent to me thanks to the use of Valve's classic red=interactible colour scheme.
The only things that have thrown me are the aforementioned padlock and buttons on computer banks.