We learned from Dave & Nance K. about Alfa Dinettes for new wood covered bases for our original FlexSteel kitchen chair.
We just replaced our original 5-leg all metal chair base with a nice upgraded look of real wood on a slightly smaller 4-leg tilt-swivel caster base. Maybe no more stubbed toes. New base comes with tilt-swivel mechanism that is a little smaller than our FlexSteel chair frame. I used aluminum angles to modify our chair frame. Other frame mods could be made for the same end result. An alternative is to reuse the FlexSteel tilt-swivel and insert it into the new base post.
Company is Alfa Dinettes, Alfa Dinettes: Kitchen Table, Retro Modern Furniture, Dining Tables, Chrome (http://www.alfadinettes.com)