damn...seems like such a simple thing to do....
pearl has a conversion pedal that has just as many "little pieces". it's just the fact that DW would rather make you buy the full double pedal kit, not that it's mechanically too complex
yeah that, but the single must be prepared to take all of the small parts... i have the iron cobra doubles and an ic single has the same basic frame but is missing holes where double hardware mounts.
i think that mainstream pedal companies should offer a single that has all of the fixings, bearings and all, for a double and a separate expansion set with a slave pedal, cam, and 2nd beater. (i believe trick, or somebody, does this already)