A self-moving lever...

[iacob alex]

  ...due to gravity ,you can see at :    www.geocities.com/iacob_alex/Some_Drafts/untitled016.JPG   

     It's a particulat application (two unequal disks,two pocket money,a.s.o....any shapes,you can imagine) of a general concept at :        www.geocities.com/iacob_alex/Some_Drafts/text028.JPG

                     All the Bests! / Alex

[AquariuZ]

Hmm. I see an unbalanced wheel with a pendulum.

Not sure that it will self-move as you say...

[iacob alex]

          Hi  AquariuZ !

  So,you see "an unbalanced wheel with pendulum"...

  My purpose was to show, a lever (a bar...) not a wheel (circular frame arrangement...).
 
  Thus and so, you can name it a "minimal"  wheel,with two spokes,only.Anyway...

  For stability,the gravity checks the relative position of CoG and fulcrum,nothing more :they must be on the same vertical line...if not,we have instability,the fall.

  Now,if it seems that this model, is "sophisticated" (to understand or to test...),I can take it as a challenge,a venture to a new simplification...maybe as a  "kindergarten" toy.Who knows?Maybe...

            All the Bests! / Alex