Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

Yes, I am familiar with it in some David Aulds, Fleischmann, Mastrand, AHI, etc. but have never seen it on a Mamod wheel yet. Will there be more in the future?...

Here is the only ebay picture the seller had of the engine. Should I be given a partial refund? I would not have paid the $40 had I seen the wheel, instead I would have passed...