I dont know wich word to use to search in al the AUMS.

But I am shure I did see this:

A player or a ball that you could direct over a "road"/"plank", that looks like a see-saw. Enterend on one side and the plank "bended"/falls down on the other side just lie a see-saw.

Wich number of AUM was it in?
(I have been reading al of them in the last month, just love the educational stuff, learn so much).