All my zulus pass pipe cleaners just fine including a Chacom blast, a Sav 404, and a Rossi Palermo 404, all three bent about like yours, and a straight Chapuis-Comoy (straight zulu? or Dublin, but the proportions are zulu). All pass pipe cleaners just fine. I accept that many more fully bent pipes don't pass pipe cleaners, though many do. It's annoying, but as long as it smokes well otherwise, and you an remove the stem to clean the shank and stem from time to time, it is acceptable. Very handsome pipe.