@Peter, here is a tip after many years of being on various forums. Do not use sarcasm unless most members know you and your sarcastic tendencies and quote people when you are replying to them. I have no idea who you are talking to, referring to or talking about and I speak English fairly well. Imagine others. For example, I am still not clear if you think PK stopper is useful or useless bc your initial post says useless but then you argue with people who say it's useless as well.