I have a GE Superadio-1 & an idea of making
a mod that would improve the tuning capability
& remove any backlash problems

Go into the radio & unsolder the leads to the
variable capacitor. Solder RG-174U coax to
the circuit board where the var cap was
connected. Bring the coax out of the radio
& connect to a quality 0-365 pfd var cap.
This var cap can be enclosed in a metal or
plastic container with a vernier dial. As an
alternative, a hole can be drilled thru the radio
with a connector mounted flush to the radio.
This would allow one to experiment with different
variable capacitors. Is my idea valid and/or practical?
Any merit to it? I realize the above may decrease the
resale value of this radio but that is not a consideration
of mine..