Hi all, I don't normally write much here but do read with interest most of your comments. I am getting on well with a simplex but can't seem to get the super heater right. The people I have spoken to have two schools of thought. 1 because it has slide valves Don't use a radiant one something to do with wet steam being better. make it out of copper. I have just come in from the garage having turned another peace of copper tube into scrap, lots of heating and i just can't get the tight bend required to make it look neat. Other school of thought is make it radiant using stainless and use thinner tubing 22g I think. any thoughts on how to bent copper tube or where the hell do I get stainless from, tried GLR and the guys a Polly. I have seen lots of super heaters made out of SS and look neat with perfect bends but nobody can tell me where they got the stuff. I have a tube bender but the radius is not small enough and of course it is metric 10mm and I am using 7/16 18g copper......... well I was! I know you will probably think how has he got this far if he can't bend copper tube but things have gone very well up to this point, I just can't afford to keep throwing copper in the bin. Great site keep up the good work Keith MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.