Big magnet, left to sit on the tail end of the CRT for the weekend (or in a cardboard box under the back end of the CRT) should screw the steering electrodes.
Or...
Unplug it, drop a cup of coffee into it.
Or...
Make friends with the IT guy, and ask him nicely to give you a new monitor. If you can justify this by showing that (for example) you regularly need to work on a large monitor at a high res (in order to process image files, or work on immense spreadsheets) then the CRT is not good enough.
__________________
╔═════════════════════════════════════════╗
Overhead, the Albatross hangs motionless upon the air,
And deep beneath the rolling waves,
In labyrinths of Coral Caves,
The Echo of a distant time
Comes willowing across the sand;
And everthing is Green and Submarine
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