[John Bartley]

I do it a bit differently. I inductively couple the signal generator to the radio by draping an antenna wire thru' a coil (random wound on a cardboard tube) connected to the generator. Then I disable the oscillator with a small value cap clipped across the oscillator section on the tuning cap. This way there are no electro-mechanical connections to make between the radio and the generator.

Just a different way ... may not be for everyone.

cheers