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Rev,
When I used cards, I used color coded paper clips so I knew which team was which, and rotated the clip over RB. I tried using the wheel when I used to coach, but it confused the crap out of me, so I stopped.
I'd say use the card.
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Felix A. Madera
USAV Indoor National / Beach Zonal Referee
FIVB Qualified International Scorer
PAVO National Referee / Certified Line Judge/Scorer
WIAA/IHSA Volleyball Referee
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