Returning the AccuSize Tapping Head

The JT6 arbor will not stay in the tapping head.  The supposedly JT6 arbors that came with it do stay, suggesting dimension problems with their notion of JT6.  Yes, I cleaned both male and female JT6 with acetone, and lightly tapped the arbor in place.  No luck.  As is usually the case, Chinese tools are usually overpriced even when free.