Remix of @Mecky1963 s T-Slot nut for M3 screws. Just add a hex nut on the bottom.
As mentioned in the comments of @Mecky1963 s version a fraction of a millimeter needs to be cut of the stem to get enough friction with the extrusion for it to not slide. This is that version.
Also made some other small changes to make it print better. I provided a version with the stem not cut too, just in case.
The author remixed this model.