Roger on the 20 which is even better because you have the end of the aileron as a reference and the flap/fuselage fairing as another reference point. I have found adjustments that were made to stop a turning tendency by cranking one aileron up or down to stop the turn, but that doesn’t work! Both ailerons will equal out the new setting by flying up (or down) a tad and the turn remains. The only way to stop a turn is by installing a small trim tap, bent up or down in the direction indicated.
JJ