I'd start at 600, maybe even 400. When I got my WW from Dtek, I started out with 600, and after a few strokes I could tell that the surface was very non-planar. An hour and a half lapping the WW really made me appreciate the finish on my MCW50.
i started at 330 on my sp-94 and went up to 2000 and it came out great, took about 2 and half hours, but i think on the ww im going to start at 600 since it is a very thin base
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