Push and hold it while turning the center plate of the head counterclockwise until the blades and pins are exposed.
Doesn't matter which side (flat or beveled) is facing up as long as all the blades are facing the same way.
The center plate of the head should snap back into place, locking the blades into the head with a click. If you don't hear the click manually rotate the plate clockwise until it snaps in place.
The pins and blades should be secure and covered by the center plate before starting your trimmer again.
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