The inspector that tested my cage showed me a piece of tube he carried, that had been bent, then cut in half.
The inside radius was visibly thicker than nominal and the outside was thinner. By my SWAG the amount of material seemed to be about the same. In Willie's chart it only thinned by .002 to .003 with no measurement of the inside radius. Personally I don't think .002 would be visible. YMMV
Ron