The trick is making the 90 at the top of the clip, needs just enough to hold it in place.
All your info is exactly how I figured you made the clip.
Good job in getting it formed into a working replacement. It looks nice for what it is!
Like you said, I bet making that 90 degree bend was a bear! The silver steel used for the binder clips handles is just hard enough to keep it from deforming with normal use which must make it a bear to form something from it.
I guess if you are really good and want more perfection that you could heat the silver steel so you can soften it some and then roll form it around the steel pin that you removed in order for your clip to fit in place!
Na, that sounds like too much work plus I don't see why your idea won't work for quite some time over the OEM plastic clip.
Good job in fabricating this steel clip from a binder clip handle. It should give others that have "clip" problems some ideas how to fabricate something like you did.