You need a lapping machine of some sort to do this properly - this video was taken at the Swatch NJ facility in the refinishing room, where we were shown how their machine works...
Note that this style is not super expensive and only used for doing the starburst finish, not for lapping polished surfaces.
Most service centers should have one, and if someone is saying they can refinish your starburst case, they should have a lapping machine to do it.
Cheers, Al
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