Macintosh Color Display M1212 - Convergence Question

[Steve Rieck]

Whenever I widen the horizontal adjust, the top and bottom corners move out but the middle of the left and right side don't moves... like this:

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Is there an adjustment to counterbalance this and get them even?

 

[mayacintosh]

Hi, there is an adjustment accessible on the back of the CRT but the cover needs to be removed and the potentiometer needs a plastic screwdriver. But anyway this monitor can't be adjusted correctly if the picture is too big, it needs at least 1 cm from the bezels.