The Galena Century Radio (GCR) Rotary Switch Base 2 x 10 Point – Base is the same unit designed for the GCR A-Runner Loose Coupler Crystal Radio. The base measures 1/2″ x 4 1/2″ x 4 3/4″ and does not have the Galena Century Radio marking. The base has been milled so it can be fitted with brass as desired and can serve as an integral part of a crystal radio of your own design.