Probably the single most characteristically mekori'ist position is that modern tefilin, mezuzot and sifrei Torah are no good, or at the very least extremely inferior, because the klaf they are made from isn't properly tanned with afaztim (gall nuts), indeed hasn't been tanned at all. Modern klaf is actually parchment and thus doesn't meet the gemara's strict requirements, which are הלכה למשה מסיני. One reason this position is considered such a no-brainer for the Jewish Originalist is that …
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