I dont know a whole lot bout what it takes for molding stuff but couldnt you make the metal button cap have some sort of T shaped shaft on the back of it and mold the rest of the button over top of that shaft to hold the metal cap on so you dont have to worry bout glue?
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-D Modifying and Tweaking is a journey, not a destination................................ MKIIa : 60gig - 040103286 - Blue - v2 + PCATS tuner MKIIa : 20gig - 040103260 - Blue - v3a8 + Mark Lord Special Edition Cherry Dock