Helix Humper was the motors product name, they were offered from Allentown Locomotive Works at one time. But, if memory serves me right, the original owner became ill and the company just kind of faded away. I have one of his Athearn repower motors in one of my brass diesels. They featured a "wormfly", which combined the flywheel with the worm gear as many Bowser and Mantua used a simple axle gear and the worm gear was directly on the motors output shaft, no idler gear. So combining the two allowed for a flywheel were none would fit before due to the diecast boiler that surrounds the motor. It is a shame this motor design did not get picked up by someone like A-Line as there are still many of these older steamers needing a new motor without the hassle/machining to install a complete new gear box. Just camp out on ebay and watch the flat of parts and motors at train shows, one will turn up.