I asked this question years ago about McCoy Circus wagon wheels. At that time some folk s were using a 3d printer but that is where it ended. I have about 8 to 10 circus wagons that need replacement wheels. Looked on eBay and googled with no luck. There are wheels made in "O" gauge but not in "G" gauge. I talked with JMM trains at a Trian show and he said if I have good samples he could make a mold and cast them. Unfortunately the wheel I have are not in good shape. Does anybody know of anyone making replacement wheels?
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