Interesting Laws of Tefillin - Rav Reuvain Mendlowitz

Many "must know" and interesting laws of tefillin: Do black straps matter? The correct placement of tefillin? Wearing tefillin to shul? Using the plastic cases to support your siddur? Shehechiyanu on new straps? A righty wearing lefty's tefillin? Interesting Laws of Tefillin by Rav Reuvain Mendlowitz