Ajusting H-Liniarity on a monochrome TV?

Hi all, My 1970's CRT TV has some horizontal linearity issues, The picture is wider on the left and more squashed the further to the right of the screen. The TV is compeletely solid state, No valves inside. There's a dial on the back of the unit which says V-Lin and i all ready got it perfect but... show more Hi all, My 1970's CRT TV has some horizontal linearity issues, The picture is wider on the left and more squashed the further to the right of the screen. The TV is compeletely solid state, No valves inside. There's a dial on the back of the unit which says V-Lin and i all ready got it perfect but there's no H-Lin. There's Horiz-Hold, ACC, Height and V-Lin which can be turned with a screwdriver from outside of the case. None of the internal dials are labelled and I'm worried I could damage the set if I adjust them. There are also some tall aluminium cuboid shaped things that have a hole in the top with an Alan key hole inside.
If anyone has any suggestions i would be glad to hear it.
Thanks to anyone who can help.
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