.....available for each of all,so to have an easy "access" to a possible gravity motor,can start with a short movie at : www.youtube.com/watch?v=FQ02MjqBk7s
There,we can use two brief sequences :
-007 to 012 sec.
-1:07 to 1:56 sec.
Here,you can add your inspiration as the "next steps" for a self-running motion...
All the best! / Alex