Jules, I built many Hercules back in the 60-70-80's. They had many Models, qx, jx, ixb, ect. They were in all kinds of industrial eqipment. I built a big one for an antique Cristcraft a few yr's ago. The owner had an address for someone on the middle of the country that had all kinds of Hercules parts. I wish I could remember who it was. I think if you google in Hercules engines you'll comeup with someplaces to call. Walt