I wouldn't put it past him for 1 second that he told you to do that so he can get your money later when it grenades.
You had someone in this thread that builds motors tell you that his motors don't make that noise. But hmmm, that fucking idiot KOC said it's good. Please tell me when a rattle in moving parts that are built to a tolerance is normal?
It's good you hot the answer you wanted to hear, but you won't find anyone on this site singing his praises.