...Another is to take a soldering iron whose tip you don't care about and just melt the case halves together. Do this in a well-ventilated area; the fumes can't be good for you...
tomlee59 is not kidding. I've been working on refining a plastic welding technique for repair of rigid and flexible plastics using a dialed down soldering iron set just above melting point. Great results, but it renders the soldering tip unsuitable for soldering by poisoning the plating, very difficult to re-tin, and will not stay tinned. Also, at a somewhat higher temperature achieved in drilling plastics too quickly, corrosive, smoky fumes are given off that rust a drill chuck overnight. Can't be good for your insides! [
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