I am working on a 1947 RCA Victor 56 X 5 = RC 1023 and the Dual Variable Capacitor Trimmer used to Trim the Oscillator BC and SW Bands went missing. It is specked at 450-600 PF for the BC and 190-760 PF for the SW band. I am mostly concerned with the BC trimmer. Any one have any ideas where I might find such a thing. Thanks