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I wanna know how to do it on a warped western razor :p

Certainly 15 mins would destroy the edge on a Dovo or similar but look at point #5 & then think on how hard these razors are, even regular J/razors. I think I mentioned elsewhere you have to...

The relevant section is called Edge Finishing, not Edge Jointing :)
You can't create "another false edge" by too much pressure when jointing. You can create a secondary bevel or destroy the edge...