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no,they take the standard non proprietary injector type blade. (if you look on ebay they have some used ones for a prety good deal BTW)

As i understand the Supply razor, the screw is for changing the shave setting. Wouldn't have the blade in it when changing the settings.

Yeah i agree about the 3 blade thing. seems unnecasary (kind of spendy too.) I i were looking for another safety razor i think i would go with the Supply Razor which takes the injector type blades....

interesting, looks like it takes half a DE blade which seems like a good idea.