P'til Tekhelet is an organisation which makes M. trunculus techeilet. Who hechshers their tzitziot?
Q. Who is the mashgiach on the process making sure it's lishma, etc.? Who gives the official hechsher?
A. R. Eliyahu Tavger is the Rav of the Amuta. The workers doing the dyeing, spinning, twining of the threads are all yirei shamayim Jews who are very careful to state explicitly before every process, “L’shem mitzvat tzitzit.”