Rotary Hook Assembly

Hello All,
I just had a machine halt on my DAHAO 2 head embroidery machine. This was caused when the rotary hook assembly spun out of control also causing my needle to break. I noticed that the inner basket indentation of the rotary hook assembly was not making contact with the retaining tab. I figured this is all happening because the rotary cup assembly moves back and forth about an inch ever after all 3 screws are tighten to max capacity.
Anyone know how I can solve this issue.
Thanks.

Location: 
United States

I figured it out. The shaft where the rotary hook assembly sits, was a few inches forwards. I was able to loosen the hex screws at the back of the shaft so that I could move the shaft to its correct position.