Chromacolor II CRT setup - black level and white level?

[N9ZQA]

All -

Got a question about grayscale setup on a Chromacolor II (25KC45 chassis). I've looked in a few different places (books, Internet, etc.) and everyone seems to have a different procedure for doing this.

In the past, I've done setup on this set by setting the 'black level' knob to the center of its rotation (it's got a built-in detent), the 'picture' or contrast knob to about 60-70% of its rotation, flipping the service switch, and adjusting all three screen controls for a 'barely visible' (the only common thing I've read in all procedures!) white line.

This results in a great looking monochrome picture, although the black level seems a little high (i.e. when my DTV box is on a no-signal channel, there is a black screen, but the TV reproduces it as a slight gray). Not too serious, but if I turn the black level knob down a bit, the black becomes true black. Whites still look OK.

Where do the brightness and contrast controls usually get set during this procedure? Is there possibly a certain procedure for this chassis? Since this set gets used quite a bit, I'd like to make sure I've got it set up correctly.

-Jim