"Using A Microwave More Efficiently"
"The limited space inside a microwave has always been inconvenient when you want to have a meal together with your friend or partner. It would be easier and more convenient if you could prepare both meals at the same time. Most of us don’t realize that the whole space in the microwave is good for heating, even above the spinning plate. To heat 2 plates at once, simply put the first plate on the microwave platter pushed to one side, then place an upside-down coffee mug next to it and place the second plate on top of the mug."
https://www.amazon.com/Panef-Corp-Powdered-Graphite-Lubricant/dp/B0016GZQ60
Now I don't use hairpins but I would think the side WITHOUT the sharp pointed end would be better against your scalp?