Looking right away at the business-end of a Lip Grip Cull Tag, we see Rapala’s approach to this mechanism. The idea is for the cull tag to pinch the fish’s mouth without poking a hole in the fish’s lip. Instead of using springs like some other systems, Rapala went with kind of a counteracting U-shaped red piece mounted inside the larger black clip.
So when you pinch on the two upper tips of the black clip, you’ll notice resistance from the red piece. The harder you pinch, the wider the clip opens. Put a fish’s lip inside, release the clip and the red piece applies pressure onto the fish’s lip. These clips are that simple to use.