I may add a comment that in my almost 70 years I've only had two, maybe three wheel cylinders that couldn't be rebuilt. It takes a while, depending on your cutting stones, but I found I can clean up what appears to be a deep pit and still be right in the middle of the tolerance which is usually .005 and have never had problems with a rebuilt. As my daughter, a math teacher says, "do the math".
You an do it.
