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Looks great! What's your technique?
Nice job !
I suspect you are using something like - Garryflex Abrasive Block - Fine 240grit
A block consiting of a rubber like compound impregnated with silicon carbide abrasive particles
https://www.axminstertools.com/garryflex-fine-brown-240-grit-272364
* I have no affiliation to axminstertools - just my first google hit 😀
Nice work!
Though it was in the context of a knife maker’s supply, seen something like this i believe ive heard it referred to as scotchbright(generic) but you can buy belts made in it too for grinding wheels.