I've bought several of these and they are all horribly unbalanced. The tool vibrates heavily above 1500 rpm, which makes fine sanding difficult. I ended up balancing one of these fairly well by mounting the shaft on a lathe, spinning it at about 150 RPM, and then lightly sanding the surface with a 4.5 inch angle grinder. Now the grind point works pretty well, but it took some effort. to bring him into this state.
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