?
My table's being recovered. It's levelled, but no cloth on yet. I started with the ball on the table with the red dot straight down, and then rotated it so the dot moved up about a quarter inch every time until the dot was straight up. I didn't get any change. I put the ball down and it stayed exactly as it was in every position. I put the ball down randomly, and it sits exactly as I put it.
I figured I'd try it. I don't see how the dot could really affect anything. It's not like a metal dot is inserted into the ball. It's all the same material colored differently. Think about a pool ball. You have a colored stripe, a number and a black circle around the number. If the colored stuff made a difference in weight, pool balls would be wobbling all over the place.