This can also be caused by the positioning of the steering shaft in the steering coupler. For the signals to cancel, the steering shaft needs to be exactly in the straight-ahead position when the wheels are exactly straight ahead. Sometimes the coupler will get replaced, and the shaft is inserted back into it one or more teeth off. Then this gets corrected by positioning the steering wheel off an equivalent amount. The net result is that the signals cancel too early in one direction and don't cancel at all in the other.

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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe