ugh!!! is the ceramic tip thing a actually attachment to the soldering iron itself? Like the needles that yyou can buy to swap em out? Or is it part of the soldering iron itself, that i'd have to unvail by unscrewing stuff? I'm confused with this. I just bought a 40watt soldering iron from radioshack.. can't find any ceramic tips for it... so this is why i ask if you have to unscrew it or somethin. please help me!