3mm Filament Clip

I have been using the original clip on various spools. It fit some early ones I had but doesn't fit well on anything from Makergeeks (which I have a lot of) nor various other sources. So I tweaked it up because I got tired of the old ones falling off the newer spools.

I have tested them on the following spools:
MakerGeeks (newer)
3 Different Chinese import spool types
MatterHacker (older)
FormFutura (older)

Do not fit or at least don't hold well on:
MakerGeeks (some older, he seemed