On 02 May 2006, Dave wrote:

They are convergence pots. They alter the relationship of the
geometries between the beams. The red, green and blue images which
make up the colour picture on your monitor must overlap as close to
perfectly as possible, otherwise you will see red, green or blue
fringes on different parts of the image. They should only ever be
altered by someone who understands how to set them up- they can be
very difficult to get back if you don't know what you're doing.

If the picture looks OK, you've got away with it.


Phew!



At least you didn't alter the static convergence rings on the CRT
neck- that really would have caused problems.

Hmmm. Let me have a look and see if I can move .... :-)