On the NAP chassis' I found the easiest way is to simply turn it upside down,
reverse the plugs and reset the purity/convergence.

I realize this may not be possible on a computer monitor because there are
usually a few tertiary coils, and even on an NTSC set it's probably not the
best solution. The NAP lends itself well to the procedure though because the H
& V windings are on seperate plugs.

JURB