I've followed the topic on Reddit for quite a while. You won't find the mechanism because no real working theory exists why this effect might be real. There are

I've followed the topic on Reddit for quite a while. You won't find the mechanism because no real working theory exists why this effect might be real. There are a few theories floating, but none of the stood the test of scientific inquiry. Current state is still at the stage to prove without doubt that the effect is real. Nobody demonstrated it so far with high enough signal to noise ratio. The EmDrive is not a real thing with a high certainty.