I get annoyed with these "how to" or ask an "expert" forums. You ask them a question and the usual reply is: Oh you need an engineer, etc. What kind of answer is that? If a person is presented with a problem it is quite obvious to hire someone in the yellow pages. I think this point gets lost on the "experts". More likely there aren't any experts on the forums. Unless of course you go on a medical web site. Everyone is a freakin doctor.