where can i get wheels to attach to a small electric motor similar to a r/c car's motor or how can i firmly attach a wheel to a electric motor (how many cm is the diameter of the axle/shaft)
similar to http://www.dse.com.au/cgi-bin/dse.storefront/49a09de7159e0cd0273fc0a87e01070c/Product/View/P9004
similar to http://www.dse.com.au/cgi-bin/dse.storefront/49a09de7159e0cd0273fc0a87e01070c/Product/View/P9004