I have an evil mad scientist (from that website) on my basement door (the workshop) at home

I've built a couple of his clock kits, and bought random parts from him!
I've not done that test, but my microwave definitely is not very even. I keep threatening to get a new one (though the door, which you have to yank very hard to open, always displacing the microwave in its precarious position on top of the fridge, is the actual core reason).
Let me know how it works with added fat!