Claim that two-stage mechanical oscillator creates free energy using gravity energy as perpetuum mobile raised a lot of discussion questions and suspicions. Several scientists also devoted some time to create mathematical models and analyze it. I had a chance to see one such work by well known scientist sent to a person on the site as reply to his work. He used well known Lagrangian technique to analyze total energy (kinetic and potential) of the whole system and found no accumulation of total energy in the time. However, I was able to find two problems in the model. First problem could be easy noticed by a person who actually saw oscillator working and second problem I noticed after I tried to build mechanical feedback loop and failed in my first attempt.
