I love the S&D. I drilled my first up and used it at oob surface and 400 grit, and it gave me great backend, and would clear the heads suprisingly well. It could be used on anything from medium to heavy, very versitile. I drilled a second for a more even reaction. I didn't love the ball oob, but with a surface adjustment to 4000 grit abralon, it worked wonders.
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