I was lucky to find this Thomas Orchestra Bells organ module on eBay, but I was unhappy with the condition of the case. I also wanted a glockenspiel to go with the street organ, so I rebuilt it and arranged the tone bars the same way as the melody pipes.
Currently it's set up with all 22 solenoids plus the positive bus on a cable. When plugged into Topsy, the signal wires go in parallel to the corresponding melody pipes, and the positive power supply is switched by a relay that's activated by the register board. That way the bells play the same notes as the melody pipes when the glockenspiel register is on.
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