Indian producers of educational kits and engineering lab models

Pendulum pump models
http://www.elabengineeringequipments.com/product-details/pendulum-pump-375.html

http://etherengineers.com/product/hydraulics-fluid-mechanics-lab-equipments-open-circuit/pendulum-pump/

Indian students who studied Veljko Milkovic's pendulum pump / two-stage oscillator as a final year academic project or student project:

http://www.linkedin.com/pub/krishanpal-patidar/4a/177/ab2

http://www.linkedin.com/pub/mohan-kumar-l/43/b68/b79

http://www.linkedin.com/pub/nikhil-bansal/4a/536/831

http://in.linkedin.com/pub/ravi-gavkare/22/445/502

http://in.linkedin.com/pub/luv-bhatt/61/b29/472

http://qa.linkedin.com/pub/owais-khan/65/149/76a

http://www.linkedin.com/pub/harihar-mishra/56/a54/579

http://in.linkedin.com/pub/ambadas-mane/4b/8a9/2bb

   Hi  !
A very old method that upsets a lot of "new" theory , at : http://en.wikipedia.org/wiki/Shadoof
So...there is nothing new under the sun , excepting the old practical mechanics.
Anyway , it can be a good starting point to develop a self powered gravity simple machine.,,,it's my opinion.
   Al_ex

An interesting video you might be interested in:
http://www.youtube.com/watch?v=yCkVmv4zizM&feature=c4-overview-vl&list=PL83620CD376BC9DA6
The cord loosens up because of the occurrence of complete transfer of kinetic energy, not just a light contact with the surface.

Overunity in Simulation by MagnaMoRo
Simulation of a device generating mass acceleration overunity and making use of bidirectional energy extraction.

http://www.youtube.com/watch?v=pjep9BFI_MU