I've had a Naniwa 12K for several months and it has gotten quite a bit of metal shavings on the surface from several uses. There aren't any directions that came with it and I'm wondering if it is meant to be lapped or if there is another means of maintenance to remove the shavings. I have the lapping plate that came with my set of Nortons so, I do have a lapping plate. Any advice will be greatly appreciated.

Thanks