.....or concept , if we start with :
https://en.m.wikipedia.org/wiki/Atwood_machine#/media/File%3AAtwood.svg
... but play / test as : www.geocities.ws/iacob_alex/Some_Drafts/text032.jpg (http://www.geocities.ws/iacob_alex/Some_Drafts/text032.jpg)
... as a continuous ("self" ) gravity unbalance (torque difference ) on the same side of the fulcrum.
Al_ex