That is Greg Sullivan - the owner of Diamond Billiard Tables. He designed the Diamond tables - yes, he knows what he is talking about. He is saying and showing that the correct place to measure a corner pocket is from point to point - the point being where the rail cushion first changes direction into the pocket. To measure any further into the pocket is not the standardized way to compare pocket widths. If measured further into the pocket, the measurement would obviously be quite a bit smaller. When someone says they have a table with 3.5" pockets, I always wonder where they are taking the measurement, because true 3.5" pockets would be very tough and would not play correctly IMO insofar as the ability to cheat the pocket and play a shot hit with spin and with some pace.