Thanks for those posts. I figured it out on my own. For each ejector there's a retaining screw that goes into the Kersten barrel extensions. You have to hold the ejector in by hand and remove the retaining screw. These German guns have really skinny screw slots - I had to grind down a bit that was already pretty thin. Now I have a screwdriver bit designated for this job. Don't think my gun has the screw for turning off the ejectors. It's at the stock shop getting refinished. I'll post pics when I get it back.
Jeff