I adjust mine by first putting the trans in neutral,put the shifter in neutral,loosen the turnbuckle,carefully wedge small peices of wood between the shift lever and the shift plate(it has to be centered front to back AND side to side),then tighten the turnbuckle.It may not be the most scientific way but it works like a charm.I've tried to have someone hold it in the center but that dosn't work very well.It sounds like your pretty close.
Hope this helps,
Ron
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