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Folded spines, in my experience, don't have enough gripping or clamping force to generate the friction needed to pull and keep the spine straight. If you try to install a folded spine that is curved like the one shown above, one end just slides back up as you force the other down.

Here's part of my take on the subject. As you read this, keep in mind that I have chosen to use slotted backs in making my backsaws. I don't use them because they are easier or cheaper to make. I use them because I firmly believe they hold several advantages over folded spines. One of these...

That is also my take on what Grimshaw wrote. If anyone is interested in reading it for themselves, it is available for download as a pdf on wkfinetools. I'd post a direct link, but it appears that I am new enough that I am not yet allowed to do so. The pages of interest are 102-106. I recall...

I have, and it's a pretty trivial matter. Just take a little bit of care to keep it symmetrical, although even that is not terribly important. Bugbear raises a good point. I, and others, think the set can be improved by reducing the angle at which it sets the teeth. As it is sold, that angle...

Tony, while I have never folded a saw spine, I have put new blades in a few old spines. If you are looking for the easiest way to build a saw, I would suggest looking for an old saw (or a cheap new saw) and using that spine. If, however, you want the experience of bending one, then go for it...