#24 While using oil in a lock would work, the oil will collect crud and dry out over time. The proper thing to use for locks is graphite lubricant. Arbitrary example from Amazon: https://www.amazon.com/Panef-Corp-Powdered-Graphite-Lubricant/dp/B0016GZQ60
"If you need to step away from your computer, place your laser mouse over the top of your analog watch. The mouse will read the ticking of the second or minute hand and will keep your computer active, so you don’t have to retype your password."
#24 While using oil in a lock would work, the oil will collect crud and dry out over time. The proper thing to use for locks is graphite lubricant. Arbitrary example from Amazon: https://www.amazon.com/Panef-Corp-Powdered-Graphite-Lubricant/dp/B0016GZQ60
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?