31. bun bobby hairstyle
Lock the pin in place. To be honest, it makes sense why the nail fell off: you push it into a bun, and then it slowly slips back. Why not? Therefore, a technique used by professionals is to “lock” the pin by inserting it from the opposite corner (so they don’t push it up into the bun, but instead push it down through the bun). And then clip some hair, Flip the sandwich pin and reinsert it at the correct angle. There must be a visual effect here. See the video below for more details.
Cross the two links. If the locking techniques seem too confusing and your pins are showing interest, try the crisscross method to strengthen them. Insert the first pin, then slide the second pin in the opposite direction to cross in the center and snap together like an X.