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I guess this -- https://www.youtube.com/watch?v=weRRIQEcca0 -- is what you mean for me to do?

Great! I have a couple of tiles lying around, so all I need is the paper and I'm good to go. Thanks a lot for your help!

You mean I have to buy something else? *sigh*

I've got some 240 grit sandpaper in the garage -- would that work, or is that too coarse?

Hi all,
I got a new Naniwa 8k and 12k in the post today, and I've noticed a few little imperfections on both sides of the 8k. Little flat lumps of extra material that will surely damage the blade...