cfchart - turn off y axis labels

I want to either turn off the y axis labels (have two chart series of dissimilar data) or have two sets of y axis labels. The CF10 help is really unhelpful (yAxis: A struct of keys used to style y axis such as format, guide, item, and label.) I've used the WebCharts designer with limited success but need to find a tutorial on it. How can I just turn them off?