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Yeah, if the eraser is too small, you can also try using one of those crepe blocks (or whatever they're called). They pretty much are just giant pieces of soft rubber that you use to unload...

Yeah, it's usually takes some extra effort to remove that last bit of annoying pitting. Keep at it with 320 if you want to. I mean, the lower the grit, the quicker it should come out.

The blade...