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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.
Tape over the base holes of shakers designed for pre-ground salt and pepper. The fine grains will easily slip through when you tip the shaker upside down to fill and the tape will prevent this from happening. 2. Turn the shaker upside down.