Thanks George, good thoughts.
I'm been thinking about this a lot. I think have a design that would allow for raising and lowering the radome and yet lock the whole mount very firmly in place.
It actually opens up more possibilities, like a wind generator mounting for when you are at anchor. Or a place to temporarily mount a high powered spotlight when doing deck work. What about an extra platform to stand on when doing mast work? All these seem possible if there was a utility platform that could lock securely onto the mast track.
For now, I'm looking at radar.