.....as a concept , with some old , compound applications / distributions , at :
     www.lowtechmagazine.com/2013/01/mechanical-transmission-of-power-stangenkunst.html
.....and with a new , simple application , at :
     www.geocities.ws/iacob_alex/Some_Drafts/text013.jpg
     So , you can play a continuous asymmetric / unbalanced gravity "wheel" ...
     Al_ex

.....so to transmit mechanical movement up to four kilometers , or as a lifting rod system that runs vertically up the mineshaft , at :
     https://en.m.wikipedia.org/wiki/Flatrod_system
     So , it's easy to test a minimal spare parts arrangement , as a possible gravity (self...) powered rolling variable leverage . at :
     www.geocities.ws/iacob_alex/Some_Drafts/text015.jpg
     Opinions cannot survive without some of our old indecisions...
     Al_ex