"Little Metal Plate On A Stapler"
"Nearly every stapler has two functions! The more common setting bends the staple back onto itself, ensuring that your papers will be held together tight. But if you rotate the base plate, the staple will bend outward, which is meant to be used for a looser hold that you can more easily remove later."
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?