Use your forearm as a strop to resharpen razor cartridges. Go opposite the normal blade direction ... you’re not trying to shave your arm. Make ten strokes.
My cartridges now last until I get tired of using them.
I don’t understand how you can go opposite and not shave your arm, but sounds good as far as finding a way to make blades last.
Awhile back someone on FR advised using the rough white ceramic ring on the bottom of a ceramic coffee mug to hone your cutting knives. I tried it and it works great!
Oh, wait, I just figured out how to go the opposite direction without shaving.