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4.5mm is sounding like the more common number. No idea what the story is with those ABE discs, but I was measuring 4.6-4.9 across different points on the disc (granted, only with a small degree of accuracy), and given the EBCs are ~5mm with a 4.5mm limit, I'm going to extrapolate from that and suggest the ABE discs followed the same logic.
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