Bounce Arc, the Grand Junction station for tracing a ball’s “exit radius”

Field notes

The site describes a physical inspection process using smoked glass rather than relying on the bounce integer printed on a club or box. Its example card records a 58° sole, a 2.1 mm exit radius, and poor clay hold after Tiara Rado mornings. Local conditions are treated as measurement variables: Lincoln Park clay can straighten the exit, monument wind can dry it, and Highline Canal dew can temporarily disguise a dead curve.