Exchanging the components of Rashi and Rabbeinu Tam tefillin
For people who use both Rashi and Rabbeinu Tam
tefillin, one of the
tefillin is always understood to be kosher
tefillin with
kedusha while the other is not. Since the casing and accessories of something with
kedusha may not be used for non-
kedusha items, the casing for one type of
tefillin should not be used for the other type and they should be clearly marked to prevent mix-ups. It is customary to store the
tefillin in separate bags as well. Some are lenient and permit using
retzuos from Rabbeinu Tam
tefillin for Rashi
tefillin when other
retzuos are not available since the halacha follows Rashi's opinion.
(
סימן לד, סעיף ד וס"ק כ)
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