The other day, I read where someone was going to try & put the smile back on a swayback blade. I figured I would share my way. I have a Wosty that is about 7/8 at the toe & between 13/16 & 6/8 at the heel so I got out one of my compass tools. I made it where the pencil was shorter than the other side & I adjusted it at the narrowest width of the blade. I made a nice mark going from heel to toe on it that matched the spine but it needed to be darker so I taped a fine point Sharpie to the pencil & you can see a rough idea of what I got.
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For those who don't know, always grind any excess off lengthwise & not perpendicular to the edge or you will break the blade!!!
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A bench grinder or Dremel can be used but make sure you have a glass of water to cool it. Once you're done, the razor won't be the only thing smiling! ;)
Of course my line isn't exactly at the grinding area but you get my point. Keep 'er as wide as possible.
EDIT: I forgot to mention it is a good idea to put a washer or similar (like I did here) to keep from accidentally pushing in & out a little when going down the spine with it:
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