Ok everyone I'm having a little trouble with what should be a simple task. I can't seem to get my solder to stick to my steel control rods. I'm using a lead free flux and silver solder and have cleaned parts with alcahol and roughend with sand paper but have had zero luck. I think I need some acid based flux but can't locate it anywhere. My Lhs didn't seem to have any answers. What do you all use and where can I get some. Thanks for any help or sugestions.