Thanks for the link. After some chipping away and persuation, I got the CRT out and inductuner opened.
The shaft is broken and first slider popped out. It's cracked near the front which seem to be the weak point.
It's still holding together pretty well but the sliders don't make good contact. Spraying some degreaser into the mechanism helped a lot.
I carefully popped the slider back in and by applying just the right pressure was able to get some reception.
Not bad considering all the old components in it. It's going to be fun recapping in stages and seeing gradual improvement - I hope!