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Not wishing to muddy the waters any furtherFrom another perspective the cost involved buying good quality COPPER tubing for a simple pot boiler is a small sum to pay when you consider the amount of work involved in building the boiler.I hold my hands up to the fact I have made brass boiler in the past but the material was supplied by MamodAs already mentioned the regs differer around the world but one thing that does not is the fact that come an accident Im sure the no win no fee legal crowd will be knocking on youre door.Personally for a first boiler built it to a proven design that meets the regulations of part of the world you live in. They are there for a reason and should not be thought of as a thing to be got round.Just simply my perspective on things .Oh and please use bronze not brass for the bushes Check out the blue book the 3bar litre rule has been changedMamod has to meet the TOY regulations as well as CE and has its own insurance to cover any mishap as per the American incident in the 1970scheers