....spinning in a cage , as a concept design,at: www.youtube.com/watch?v=RCE_xM-f-Xs
and a resembling tumbling performance,at: www.youtube.com/watch?v=bQCz9vRdmN8
Their common design: lever,fulcrum,two masses.
     All the best ! / Alex

You forgot the energy which the "hamster" (the man risking his life in the contraption) puts into then system.

In the video with the "two green white disks carried by a cog wheel" you should put a motor (common axle with the cog wheel and the green white disks), then it will work.

But of course, you could just ask the poster "circle", because he knows the secret of the Bessler wheel. But "circle" is not able to demonstrate it (which is a minor unimportant detail).

Greetings, Conrad

.....can be , in my opinion , a minimized gravity motor concept (first lines).  Non multum , sed multa...
In this manner , we have a single problem to solve ,that of the mobile mass ("hamster") ,due to gravity and rotational inertia ,only.
       All the best ! / Alex

 
.....can be imagined as a diversity of motion.
Take a look at : www.youtube.com/watch?v=5LCjRXAO7NE
A metronome is a swinging counterweighted pendulum (fulcrum,rod/lever,fixed mass/pendulum and moving mass/inverted pendulum).
We can imagine a continuous rotating metronome ,due to a torque difference on the same side of the bearing,..if the counterweight (mechanical "hamster") is  moving to and fro....
...but to get a "self" to and fro ,we need to find an "equivalent " motion.
       All the best ! / Alex

A metronome has a source of energy.

It has a spring to be wound up like a clock, or a weight which is lifted and sinks slowly down. Modern metronomes have a battery.

Greetings, Conrad