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On the cheap: measure a string to be the total circumference then cut it in half and use that to find the two points.
I cant cut it in half lol, i dont have a saw, and then i couldnt put it back in
Two specific antipodes or just you need to mark and work on the poles?
Color in an entire sheet of paper using a pencil. The sheet will be covered in pencil lead that will stain any surface it touches.
Place the sphere on this sheet and roll it in a straight line (easiest if it's a small sphere). You should have a circumference drawn on the sphere.
Now put it down so that an unmarked spot is touching the lead. Roll it in a straight line again to get a new circumference.
The two points where these circles intersect are antipodes.
Spin it and put a mark on stationary spot on top? If it’s wobbly to do both poles, put it on a ring, place a dot in the center of the ring, and then spin.