When we put on tefillin, we (I am Ashkenazi) say 2 brachot -- l'haniach tefillin and al mitzvat tefillin.
The second makes sense -- I am making a bracha on fulfilling the mitzvah of tefillin. But what is the definition of "l'haniach"? Is it "to place" or something more?
I ask because I wonder what the action is that is required -- I do not "tie" my tefillin when I put them on so "ukshartam" must mean something besides tying like a knot. Is the mitzvah in the wearing of them or in the wrapping, neither of which is either "placing" or "tying."
Could I buy "pre-wrapped" tefillin and fit my arm in like a sleeve so the various parts end up in the right spot? Or is there something about the process which is required?
[if you look up the phrase "pre-wrapped tefillin" you will come up with something my dad thought up a bunch of years ago as a gag. Now I wonder if it could be halachically feasible]