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in principle you can do it on the yellow as LX shows in his video.
the question is how much time do you want to spend doing that. At the end of the day it's just removal of the unnecessary metal. my...

it also looks more like slate than blue to me, but yes, lapping will tell you right away.


If you're cheep you get a wet/dry sandpaper in the (300-500 grit range) and a flat surface - marble,...