Hi guys,
This is a rare and probably a custom stem of salsa.
It isn't an ahead but a quill stem with replaceable quill.
A comparison with normal salsa quill stem
Because the upper part of stem is thicker than quill, it is possible to assemble without threading on the steerer. With pushing bottom of quill against spacer you get the right tension on the headset bearings
It works really fine and I'm excited