Can wings in pneumatics that are metal be concave and legal?

My team was going through inspection and the ref told us that since the corner of where our wing was attached to the robot was concave. But I was also told wings can be concave and legal.

Wings can be concave and legal but have a high chance of causing multiple triballs possession.

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Better to read the game manual yourself, verify what someone tells you, and know exactly what the rules are: VRC Over Under Game Manual - VEX Robotics VRC Over Under Game Manual - VEX Robotics

Use the search function and look for concave

As you read the Game manual, note that it will never tell you if a particular mechanism or strategy is legal or illegal, but rather what makes something legal or illegal is how you use the mechanism or apply a strategy.

https://www.robotevents.com/VRC/2023-2024/QA/1610

Concave spaces are ok possessing more than 1 tri-ball is a violation. At inspection they may warn you of a concave structure on your bot that could potentially possess more than 1 tri-ball. Make sure you read and understand the difference between plowing and possession. Then make sure you don’t possess more than 1 during the match.

In Q and A it was said as a gray area but repeated after it being determined illegal could lead to a DQ