Mahloket Rishonim how many strings should be used in the Techelet.
- One string (Raavad)
- Two strings (Rashi, Tosafot, Rosh and Tur)
- Half string (Rambam)
In a case of an argument like this who would we follow? I also read that Rav Meir Mazuz Shelit"a follows the opinion of the Rambam.
EDIT: what's also interesting is that we would never know for sure because randomly Maran decided to base his Halachot on different sources. For example: Bet Yosef O"H 426 cites the Shaare Orah (Mekubal, Rishon) that holds to wait 7 full days in order to recite Birkat HaLevana.
We will never know...