Hi !
The "very old news" (Villard,Taccola,da Vinci,Bessler and others ) ,you can look on with pleasure ( inclusively to buy...),at: http://en.fotolia.com/id/5184926 and there "...perpetuum mobile,pendulum...".
A good news can be your "contribution" ,if you maintain the old basic idea,but you imagine and test it with a single hinged arm...
All the best! / Alex