This is my idea - think on a Kenneth Claypool's pendulum (pendulum on rails), with a Feltenberger pump mechanism attached to the axis (AND/OR, may be, a Milkovic's mechanism with a pump). Now apply a mechanism or electromechanism on the mobile pendulum, for do this - using the bearings and rails, when the weight rises its maximum, pull fast the axis to the next direction and keep it there, over and over... So that you have two points, say right and left, and you kept moving the pendulum between these two points all the time, moving fast to the other direction when the weight stands for a second on its maximum.
This configuration with this pattern of movement could create a overunity system.
Here is my idea, let hear what do you think about.
Apparently a maximum position higher than the horizontal line of the rails / axis, results in a higher efficiency. As said, at that point one must to make the switch to the other side (right or left) as correspond.
Any mass need energy to accelerate. Also the pendulum. Any pendulum under variable conditions must be kept going by applying energy into it. If a pendulum are suppose to make forward movement, the energy in the pendulum will be tapped, and must therfor be "refilled" from an external energy source.
If you make a drawing of your idea, it would also be easier to understand it.
Vidar