Regarding bumping ads in the classifed forums, we've just installed a new (customized) add-on that will change the way ads are bumped to the top. Please refer to the post "Bumping Classifed Ads" for details.
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What is the outer diameter of the hub cap? I've seen these come up for sale on ebay many times. This is a standard type of cap used on many different tricycle makes and models back in the 1920s and '30s and they do come in different diameters.