Hey Ivan!!! I think I am the victim...er...I mean person that you are referring to, and I have no resentment nor regrets for following your advice. I am looking at it as a very educational learning experience.
My biggest mistake was buying a trumpet from eBay where the first picture clearly shows the 2nd valve stuck in the down position. As I mentioned in the other thread, I think that trumpet already some serious issues.
PLEASE keep doing things the way that you always have. Don't worry about me...I'm the one that put a gaping gash in my forehead removing a stuck slide. (That was also a learning experience)