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Have an early Model Power F3B Dummy unit with plastic wheels. The wheels tend to bind and cause the F3A to drag the unit. Want to change to metal wheels but dont know how to determine what size the existing wheels are. 33, 36, 40 etc... Will have to order them so I want to ensure I order the correct item. Would consider changing the entire truck assembly but can't find any resources for them. Any advice, supplier recommendations would be greatly appreciated.