.....as a particular design , intended to play a continuous gravity unbalance , at :
https://m.youtube.com/watch?v=jOeUBGUI3rIh
You can play this concept...as you like...
Al_ex
.....or more precisely an oscillatory variance of a single arm of a lever , as :
https://m.youtube.com/watch?v=CJnSeTmMau4 (https://m.youtube.com/watch?v=CJnSeTmMau4)
...can be a suggestion to replace the circus performance(the to and fro translation of the center of mass , so to play a rotating seesaw) , with "something" equivalent.
Al_ex