try bending the yoke edges out & watch the effect. If they need to bend in
the yoke has to be pushed forward a little then the edges bent out, then
wedged. If you do loosen the yoke mark it so you can go back.
If its magnetized it will usually throw off the purity only unless
its real bad. Use an all red, blue or green raster to check purity.
The degausser will make a hum for a second with a COLD start.
A few will do it at turn off but thats rare.
73 Zeno