Mr.R wroteTranslation for "glas blastring"...
I think it's known as "Bead Blasting" in English.
This isn't something that I'd do with any of my motors, it takes ages to clean all of the debris after doing this and if you miss just a few glass beads they can wreck a motor in a very short time.😯
I've seen a few motors wrecked after someone hasn't spent long enough either blanking everything off before doing it, or not cleaning everything perfectly after doing it.
Steve R
Yepp!
Cleaning the parts takes a lot more time than the actual blasting.
Cheers
Thomas