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Old Account
If I do not how to fix it and especially not having the right certificate to do so then I would say:sorry but that's out of my skills and it needs professional hands! No one will be point at you and say what a plumber, no he will appreciate it as you do not mess with his health and safety. It's nothing wrong with not knowing few things, the whole life is a learning progress. I am not ashamed of having not knowing all.Think it is more down to a little knowledge being dangerous myself, somebody read somewhere that it wasn`t right and thought "I know how to fix it".