I need to try and make up a cable (9 pin D to 2.5mm stereo jack). Previously I have suffered no problems making up small Maplins kits and making up audio & MIDI cables, however, these new cable components are of a similar size but I just can get the little f******s to stick together. I'm sure I used a 15w iron for the other (audio & kit) stuff, but the one I have now is 30w. The solder seems to take too long to melt, then dries and goes crumbly almost immediately with a dull surface, not shiny like recently melted lead. These are problems I didn't experience before. Is my iron too hot? Is the solder too thick? Is the solder the wrong stuff? I was considering one of the Maplins own irons either 15 or 20w. Any help appreciated.