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I agree with Morty. You can push the blade to tests its limits. Who knows, you may get another 2 good shaves out of it. I always look for a "good" shave, though. If it pulls 1/2 or 3/4 way...

I have a 1963 Gillette Slim Adjustable DE razor that opens its top for blade removal/install--similar to yours. Out of the numerous DE blades that I've tried over the years, I have never found one...