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When I played in HS, '60's, I got on a ladder, with a ball, and verified that it was impossible for the ball to stop on the flange. Then, when they replaced the rims at our HS, the new apparatus had an additional 1/4" plate added at the back of the rim, as reinforcement to help protect the glass backboards from breaking when the ball was dunked. That added depth allowed the ball to come to rest on the flange, but also made it "6 1/4" from the plane of the face of the backboard to the nearest point of the inside of the ring," (see NFHS 1-11-1 and I suspect that a measurement of current rims would so verify.
Yes, I do get accused of being anal at times. . .
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To be good at a sport, one must be smart enough to play the game -- and dumb enough to think that it's important . . . 
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