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Ideas to add uniform thickness to a sphere?

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I've been noodling on a 1/48 Sputnik made from a ball bearing, but the readily available diameters are off (plus they are hardened and impossible to scribe).  I have a 7/16" (0.4375"/11.1mm) diameter sphere that needs to be 0.475" for a 1/48 Sputnik.  So, I need to add a uniform thickness of about 0.020" (0.5mm) all around. 


My current thought is multiple dips in Mr. Surfacer 500 and randomly rotating it the whole time while I wait for it to dry.  Definitely easy to scribe, but I figure you lot are more creative than I am and might have some better ideas....



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