(ET) mower blades

[Jeremy Gagliardi com]

I have 2 full sets of mower blades for my ET mower decks.  However, all
6 blades are "about as sharp as a sack o' wet mice"*

As such, how do I sharpen them?  At Home Depot the tool man suggested
using a stone bit, only with something like a Dremmel, not a drill, as
the speed needs to be fast to sharpen the blade.  Is that true?  If so,
will a drill just do it slower or not at all?  Do you all have any other
recommended way of doing it?

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*Foghorn Leghorn