Time to get this site upgraded, so we are passing the hat around. We appreciate any donations. Seriously, even a dollar helps. The payment page may be found here - https://www.audiokarma.org/support.html
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in keeping this site going.
I seem to recall form disassembling my 40 that the volume knob should be left on, and that the entire bakelite ring around it is attached (only) to the chassis. If I recall right one can pull the knob and the ring around it out with the radio chassis.