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If the "wiggle" you mention moves along slowly in a wave action along the side of the raster then you've got some 120Hz feeding into the horizontal sweep circuit--a sure sign of a bad 'lytic somewhere in the power supply.
If the raster is narrower at the top or bottom--keystone-shaped--then the yoke is suspect.
Another member here was going around in circles over weak HT in an old Zenith, and discovered that the new flyback he put in was the cause. Swapping it out again fixed it.
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