I can't help you. But I looked at taking these apart when I restored the '42 to have them replated. I could not see a way to do it with out tearing them up, and possibly not getting them back together. I just looked in the 2016 filling station catalog and they list them for $250.00 a pair. I ended cleaning mine up the best I could and used them as is.
1928 Chevy Coupe
1942 Chevy Sport coupe
1949 Chevy deluxe 4 dr.Fleetline
1954 Chevy Bel Air HTP
1955 Chevy Bel Air HTP
1970 El Camino
1990 F##d Mustang Convertible
Life is like a roll of toilet paper the nearer the end the faster it goes.