I started piecing the columns together this evening and I was still having some troubles with the batik fabrics wanting to go down into the bobbin area. I'm using a brand new Schmetz Microtex needle which are the extra sharp ones they recommend for batik fabrics because of their denser weave.
Wanda of Exuberant Color http://exuberantcolor.blogspot.com/ made a comment on part 2 of this series that she thought I could make a single hole opening with tape and a piece of cardstock. Punch a hole with a 1/8" punch and tape it in place between the feed dogs.
Well I found some heavy plastic that is used to make templates and I cut a small square from that. I didn't have a hole punch, but I used the pointy end of my seam ripper and placed a hole in the middle of the square. I then trimmed it down to size to fit over the area of the opening and yet allow the feed dogs free movement. I used some UHU Tac - removable adhesive putty to keep the plastic square in place and then tried out the new invention.
Here is the results. Even the little squares sewed up very nicely and no pull what so ever. So for the time being I will go with the make shift solution but I think a single hole opening throat plate will be on the wish list for future upgrades. Thanks Wanda for your great suggestion.