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I believe that with the new salt and pepper shakers, the salt shaker is the one with 3 holes, while the pepper goes in the one with 2 holes. Salt is used more than pepper anyway. Pepper should only ever be fresh ground at the table, meaning salt shakers win out.
My cartridge doesn't have a separate slot for the developer powder like the link shows with the thin strip of tape being pulled back. I have just one hole, so maybe I will just have to shake the two powders together. I have a XEROX phaser 6180.