CuNiFer - every day is a school day Tristan ;-)
Cheers, after doing a bit of research into the material side, I knew i wanted Cunifer / Do they spell it Kunifer in Germany or something? Iron is to difficult to work with and copper is too soft. Do you use a hydraulic flaring set up or hand driven dies?
I almost bought a sykes hydraulic kit once (does steel also) but it was a bit pricey for the use I'd give it (hobby mechanic).