Moshe Y. Gluck wrote: > Do we have any idea how fast this Minhag spread? Maybe it took a long > time. > Besides, there are many Minhagim, I believe, based on the Zohar which people > found out about, somehow, sometime. But it's not a minhag, it's a halacha. If one may wear tefillin on Hol HaMoed then one must. Daviod Riceman