Someone told me I should suspect the main rotor housing, so took the whole head apart, leaving only the swash and the main shaft on and I gave it a try. I watched the main shaft closely while it was rotating at low speed and I couldn't notice any wobble nor vibration at all.
From this point, I started by installing only the main rotor metal housing, I screwed it to the shaft directly without the seesaw or anything else and I redid the test. This time I could easily see the housing wobbling at low rotating speed!
From this experience, it seems clear to me that my housing is a little bent or something, because it wobbles with only this piece on. It's weird, because I didnt crash at all, maybe I bent it while working on the heli or transporting it.. anyway, I'm gonna replace it and see if the vibration goes away.
I will post the results when I receive the new housing...
In the meantime, here is my main suspect:
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