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Most all razors have the tang grand at an angle on one side, but not the other. Unless care is given when putting the scales on (DA does not take such care..) you will run into trouble.

I think...

At $9.50 a shot, these things are almost as cheap as Mach 5 replacement cartridges!

You should purchase them buy the bunch, and when one wears out, or is defective, you throw it in the bin, and...