I need 10 or 20 off Hornby type (ie metal, with a 2mm dia axle and insulated to axle) disk, ie non spoked carriage type wheels, for a number of Corgi trams I am motorising. However I need a small wheel dia of approximately 9 or 10mm in order to fit the tram castings. I already have just one such wheel-set of 9mm dia so I know they exist somewhere. A search on the internet has proved fruitless. Can anybody help by pointing to an economical source of these? Any help gratefully received.