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If you don't change the stones and rarely use them, maybe they will perform the same on the long run. I can't tell as I never used them with one type of stone only and they tend to disintegrate over...

Too much variation in behavior from stone to stone and grit to grit. Requires a very good cleaning after with some stones. I've tried them and eventually gave up long before this video was made. I...

Not really. The rust erasers are terrible. Coarse Shaptons need a conditioning stones, better use some very low grit small SiC stones that no one wants and are dirt cheap.
If you are looking for an...