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By the way, I mentioned the possibility of a bum razor because I have one of those. It's a quite nice old 4/8 that was never used, that I bought almost sharp. It sharpens, then loses it halfway...

I would say that if this happens only with razor A, forcing you to continue with razor B, but never the other way around, B giving out forcing you to move to A, then the problem is the razor, A. If...