I did check. The speeds are adequately close for manual milling. I recall they were within 20%. It's not like I'd be rigid tapping with it. I could adjust using the motor turnbuckle or indexing the speed dial as shown in the manual.
On my machine, the results would depend on whether I came at the desired speed from above or below. If you consider that the speed is set wherever a rubber belt and a bunch of springs decide to seek equilibrium, it is not surprising the speed can vary from what is indicated on the dial.
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