Those are good color bars.
Before messing with convergence, I'd look at a crosshatch test pattern (or dot pattern) to judge whether it really needs improvement. Read about convergence in the manuals. Convergence is a multi-step procedure, not just one little tweak. On a color "roundie," it's difficult to get perfect convergence around the edges of the screen.
You can also look at regular programming to judge convergence. Look at the edge areas of the screen -- left, right, top, bottom -- and note whether there is "color fringing" around the edges of objects. This may be more obvious where there's lettering on the screen.
Some small amount of mis-convergence is pretty common in my experience. Ask yourself if your picture would bother you in everyday watching. If the answer is "not really," you could skip convergence for the time being. If your convergence is already pretty good, and you screw it up with hasty adjustments, it could be hard to make it that good again.
Phil Nelson
Phil's Old Radios
http://antiqueradio.org/index.html