Here is a response to the "disturbing news" in the previous post.
I have some photographs of ancient STAM. The right side head of the letter Tzadik is not a straight Yod and not an inverted Yod. It is like the letter Zain, which has protrusions on both sides of the neck.
It looks like Beit Yosef took half of it, and the Arizal took the other half.
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