There is a custom by many to wrap the strap of the tefillin shel yad around the middle finger three times. Is this halacha or is this a common minhag that is rarely broken and nearly universal?

Note: I seem to remember a question like this already floating around. I tried looking for it but I couldn't turn anything up. If it does already exist, could someone please point it out to me?


Rambam (Responsa ed. Blau #159) and Rosh (Responsa 3:2) cited here, write that it is not a necessary part of the mitsvah

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