Originally Posted by
Aubergine
I also cast a careful eye at those 3TTT slits. Notice that the slit does not end abruptly; the metal at the inside of the slit angles out toward the outer edge of the seatpost. (You can just see the angled bit at the top of the slit in the OP's photo). Seems to me that this diminishes the stress risers that the old AVA and other stems had.
They all have that "angle", really an arc; it's what you get with a slitting saw which is circular.
And *all* such stems get (from me) holes at the tops of their slots.