My solution was to drill holes and forcefully thread in two long M5 bolts. I then silver soldered them in place and cut them down to use nuts in securing my water bottle cage... Talk about a HACK... Ha
None of my Franken Bikes are "Wall Hangers"... But they are ridden and PROVEN...
As Quoted by one of our tribe: "Steel Is Real", I would not do this on anything but a steel bike.
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No matter where you're at... There you are... Δf:=f(1/2)-f(-1/2)