The old toothpick trick works perfectly. It prevents you from squeezing the clip too much and flattening it out. A round wooden toothpick works best, just the shape you want and it "gives" a little.
Don't use needlenose pliers unless you also use a light touch. Finger pressure is often enough IME. Like any electrical connection, clean surfaces and a snug fit do work best.
Don't use needlenose pliers unless you also use a light touch. Finger pressure is often enough IME. Like any electrical connection, clean surfaces and a snug fit do work best.