If it works for you my friend then it works.
There is no set rules about how we go about it, just as long as were happy with the results.
I have stopped using my whisk all together now, i just shake vigorously and leave alone. No heat either. 
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I like that !
Started with my free shaker version of a simple drill with a tie wrap, then upgraded to a 10$ mini milk frotter
i have a corded rotary tool i once used for grinding my old dog’s (coach) nails.
i employed your first design. the results are F#^%ing perfect. much appreciation.
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