It sounds to me like you are more then a little sensitive, maybe for good reason, as I have no knowledge of your personal history with Carlos. However, I did not read Carlos’ post with the same “tenor” as you did.You need to do a little research my friend. There is a very large amount of people that have been screwed by this guy you say is an expert. Me included! If that is what you are after then by all means carry on.
The issue I have is the keyboard commando obviously did not read the ops post about surfacing his parts as Carlos suggested. He instead jumped at a chance to contradict someone else. I have a decent amount of knowledge when it comes to o'ring material as I work with them quite often in my line of work. Am I an expert? No I am not. I am the first person to admit that I have more to learn in my life and I set a goal of learning something new every day. If a person goes through life believing that they know everything they cannot learn.
I can't tell you what material o'ring the op used on his cylinder as I have not been told by him what it is. Has Carlos? Probably not. I do my best to ignore his condescending comments and his belittling attitude, but to ignore the op just so he can try to school me?
I'm so fortunate to have Hybrid Engineering, LED, and ESR in my area and on speed dial. I do not and will not buy anything from Carlos or accept his information. It comes a too great of a cost.
I would also say the even if Carlos’ intended what you think he did, there is still no reason to not continue to engage in the conversation.