a properly machined grinder should not cause metal flakes

if you are getting flakes yours might be defective or or got smacked into which caused the two halves to go out of synch

i currently have a grinder made out of high impact plastic, guaranteed to never break

before that i had a two stage aluminum grinder my friend (a machinist) made for me, that thing was the tits, but unfortunately i got stoned and left it in the woods when i went camping