^ Coming from a guy who knows. Their website says 14K max speed. Oops. I almost made a large mistake. One that would have hurt. FWIW, I did the math and the outer edge of that bit is traveling at around 200 mph at that RPM, to put it in Joe-Bob terms.

I only ran the thing for a few minutes last night and that was enough. I'm going to shop for a variable speed device, several available for around $40 - $50.

I think though that if it were very far off balance, the thing would have shook my fillings out.

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1986 300SDL, 362K
1984 300D, 138K