Originally Posted by
LaTuFu
What kind of surface does the end of the grub screw have? Is it flat, semi-rounded, or pointed?
If it isn't flat, try grinding a flat spot onto the end of it. Or, you could dremel a small dimple in the flat face of the motor shaft.
The bottom of the grub screw almost looks a bit rounded. I think I'll try to flatten it a bit and then go from there.