HaRav Moshe Mordechai Karp

To quote from Ben’s Tallit Shop:

“Why don’t more Ashkenazim tie techelet according to the Tosafos? One reason might be found in a responsa written by HaRav Moshe Mordechai Carp in 5772, where he notes that you cannot use a techelet string in place of white, therefore if halacha is not like the Tosafot, you would have too many techelet strings in your tzitzit.”

Tying Method

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Minhagim

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AshkenaziFull

Videos

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Wearing Frequencies

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What He Does

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Posek
TalmidR' Elyashiv