RCA 9T246 linearity

[dtvmcdonald]

I've got an RCA 9T246 (or so it says) that lost vertical sync, it could not get slow enough.
Removing the case seems to have permanently cured that.
A resistor might have been shorting out, I moved it a bit.

I decided to realign and readjust it. The alignment was difficult, and
would change when put back in the case, which is metal. I was able to get
a bottom cover off and adjust a few coils with it in the case. This gives
a quite nice picture.

But the sweep linearities are abysmal and hard to adjust. The outer
areas are squashed. Its almost as if the yoke was misplaced. I've
got it so all centered circles are circular, but a crosshatch shows the
squashing. Swapping 6SN7s changes nothing.

Does anybody have any ideas to fix this?

The RCA manual for that set does not correspond to reality. It appears that the one for the 8T241 matches mine.