Not convincing, IMO. While the pad gets goodcontact with the ball, the main pressure will still be directly under the drill axis. You also need a stable cup, if you "drill" from the side you push the ball around and do not get pressure on the surface. Polishing might work, but I see it as a tedious task with this solution.

Personally, I went the other way around: a spinner-like ball cup on top of a hand drill, mounted on a stable bench. This allows sanding/polishing just as on a normal spinner.
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DizzyFugu - Reporting from Germany

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