ZYGI
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Matt,
You are correct, its not a 1/2 circle, its an arc the 2 5/8 would be the cord height. There is a formula for this, but I can't find it right now, I've gotten lazy over the years and let my CAD program figure it out. It came up with a 3.99107" radius, a 4" radius will work just fine. Just remember to round the inside of the port prior to assembling the box, round the outside of the port over after the box is assembled.
BobZ
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