I've made a bloody mess!

[veg-o-matic]

WHAT was I thinking?
In regards to my Dumont, I decided to take matters into my own hands and see if I could get 'er running okay. I guess years of experience haven't meant a darn thing!
Anyway, I did a purity adjustment, and it came out all right, I guess. Then I started messing with the vertical linearity and height controls (I think) to see if I could get the picture in shape. Got some sizzling noise and loss of vertical hold from the linearity control and loss of vertical hold which I could fix with the "regular" vhold knob from the height knob. When I left it, the picture wasn't any better but it still filled the screen.
Then I went through the SAMs and decided to reseat the vert-mult/vert output tube (that's what it says. It's a 6GF7A.)
HUGE mistake.

Now what I have is a picture that only fills the top 3/4ths of the screen and consists of horizontal scrolling bars of red blue and green.
Looks like crap!
Bugs Bunny is no longer in color!
Never should have taken off the back!
I should know better!
Any ideas? I'm starting to think I should just throw a cloth over it and call it an end table.
Shamefacedly,
Bob