Just curious to know, is it possible and safe to cut this slotted part of the stem and make a new slot slot on top?
I need a shorter stem for another project.
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For such a basic stem, i don’t see a problem with this provided you round the top of the slot just like the old one to limit stress risers and note the new minimum insertion depth. You may have to file the mating surface (internal) to match the old end if it is not simply cut (a taper may have been filed into it to help the wedge sit nicely).
I can see several problems.
Firstly, stems stay attached to the inside of the steerer tube by a wedge or an expander plug. From your image, I can't be 100% certain which it is.
If it's an expander plug, you need to:
If it's a wedge, you need to:
The slot strongly suggests it could be an expander plug rather than a wedge.