There may be two controls - amplitude and phase. Pincushion amplitude
as its name implies, controls the size of the correction. Pincushion
phase affects where on the sides it is applied. Don't expect perfection.
|NotTaR of Television Sets : Pincushion adjustments
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If the controls have no effect, there is probably a fault in the pincushion
It is best to make these adjustments with a crosshatch or dot test pattern