Stupid question about lap counting cards

I have purchased a spanking new set of lap counting cards so that my workout group can help one another as we slog through the Checkoff Challenge. I purchased a holder for said cards. Here is the stupid question: How do I open the holder so that I may mount the cards on it?
Parents
  • "At one California high school meet where there were no lap counters, nearly an entire heat of the girls’ 500 freestyle lost track of how many laps they had raced. Everyone in the heat except for the girl in last place assumed the girl in first place was keeping the right count. While everyone else was hanging on the wall thinking they were done with the race, the girl in last place—who knew exactly how many lengths of the pool she still needed to race—flip-turned. By the time the others in the heat figured out what was going on (and what the coaches had been yelling about) the girl who had been in last place was nearly 25-yards ahead of everyone else. She finished the race in first place. Always count your own laps. Even if you have a lap counter." I can see losing count on a 1000 or 1650, but a 500? I've always found it odd that people never seem to use lap counters on a 16-lap 400 SCM, but almost ALWAYS seem to use counters on a 20-lap 500 SCY free.
Reply
  • "At one California high school meet where there were no lap counters, nearly an entire heat of the girls’ 500 freestyle lost track of how many laps they had raced. Everyone in the heat except for the girl in last place assumed the girl in first place was keeping the right count. While everyone else was hanging on the wall thinking they were done with the race, the girl in last place—who knew exactly how many lengths of the pool she still needed to race—flip-turned. By the time the others in the heat figured out what was going on (and what the coaches had been yelling about) the girl who had been in last place was nearly 25-yards ahead of everyone else. She finished the race in first place. Always count your own laps. Even if you have a lap counter." I can see losing count on a 1000 or 1650, but a 500? I've always found it odd that people never seem to use lap counters on a 16-lap 400 SCM, but almost ALWAYS seem to use counters on a 20-lap 500 SCY free.
Children
No Data