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RSO is Razor Shaped Object. Looks like a razor, but doesn't shave.
Sorry to hear about your purchase. I'd bread knife the edge and use it to practice stropping. Or reset the bevel to 30 degrees and...

Welcome to SRP!
Make you sure you go to the Library and look over the beginners info and feel free to get lost in all of the other material for hours on end if you like.

Where did you get your...