The people at Ptil Techeilis in Kfar Adumim make all the different knots including the Ramabam 13. I wear the Rambam 13 also but not because I am a Sfardi. I looked at the Rambam in Hilchos Tzitsis and my take was that he seemed to say that if you were wearing Techeilis, his method of tying was the way to go. He says that if you were not wearing Techeilis than your current way is okay and preferred.
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