Help me understand the 630 horizontal circuit

[miniman82]

Specifically, the oscillator and control section.

The chassis I'm wanting to use for my color wheel set has a problem I haven't encountered before, and since the only experience I have is with the synchroguide circuit found in color roundies I figured I would bow to the wisdom of the B&W forum this time.

Issue is I can't get rid of the horizontal blanking bar in the raster, the instructions tell me to adjust the back of the transformer till it goes off the right side of the screen but when I do that the image gets all wavy and I lose sync.

There's a wrinkle: the flyback has a tuning cap on it that shorted out, so I removed it. Is the lack of that capacitor enough to cause a blanking bar in the screen? It's only a 68pf cap.