Thanks for your 'advice' phrased as a very rude statement. I have received a lot of excellent, friendly and very helpful advice from several people, most of which I would follow, if I were able. That which I can follow, I will. THEIR advice was given in a friendly, supportive way, even offering personal help in their workshops, which I find most heartwarming. Your phrasing I found unpleasant and insulting. My question at the head of the thread was, is it possible to change valves individually, a question which was ably answered, and advice and discussion ranged from there. At no point did you become 'us', or even, with your attitude, a welcome part of them. How dare you tell me in such a way what decisions to make. Kindly stay off my thread and leave it to the nice helpful people. Thanks.