Super hard Disston D8.....can't be filed...!!!

I wrecked a couple of files trying to sharpen very hard Disston D8. Is this normal? I was able to get a workable edge on it using a diamond file. The saw is very old so how did anyone ever sharpen it?

Thanks,
Bill

I think the short answer is that most modern saw files are crap.

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Originally Posted by ian

I think the short answer is that most modern saw files are crap.

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I wondered about that but they're saw files I purchased at Lee Valley Tools. For the heck of it, I bought a couple at Princess Auto and wrecked them too.....:)