I'm curious about the cut Ambrosio stems, having slots and of course a round, tapered wedge.

If one cuts one of these stems down, isn't there a taper on the inside diameter of the cut end that needs to be restored?

And does the quill's wall thickness not increase above the slots, where the expansion strain/flex would tend to incur much higher bending stress, possibly leading to cracking?

I know it's a lot of assumptions on my part with regards to the variety of such stems out there, but shortening a stem other than the slanted-wedge type seems to be fraught with complications.

I only mention this because I tried it once and was left with some doubts about the quality of my un-tested modification.