Pivot on point help.

Looking for a bit of help or guidance with this. Basically I'm trying to recreate a spiked ball on a chain behavior, where the actor will pivot on a certain point. There are two similar behaviors I've looked at but one doesn't work at all and the other does something a little different to what I'm trying to achieve. I'm afraid the math required to do this is a bit beyond my ability and could use some help.

And example of what I'm looking for.  https://www.youtube.com/watch?v=tNqpBbwBxN0

Any help or ideas are greatly appreciated.

Click in the "Appearance" tab of the spiked ball on a chain, select "Custom" in the "Origin Point" dropdown, set the coordinates of the pivot into the image. Now you can rotate the image using the code block: "turn [self] by [n] degrees"

Thanks so much!