Helixed sweep problem

Would someone have an answer to this, I need to design a shoot to transfer product

from one level to another. Problem is the part design keeps flipping upside down as

it's get to the top, what would I be doing incorrectly.

I may have made this part file way harder then need be.

I design it in SW2010, I can receive SW2011 also.

Thanks ahead.

SolidworksSheet Metal