Braun, BAD
In 1967 I bought a Braun coffee grinder from Design Research like this one, mine white

I wrote Braun, asking for a new blade.
Braun replied, one short sentance:
"Your Unit is Obsolete".
My brother sent me a new blade, didn't fit, but, looking at it, I figured out, the secret is to file the edge of the blade flat, not sharp like a lawn mower blade.
It still works,