SKB,
Maybe clamp a piece to the ejector blade, then drill and tap on the joint, turn in a full diameter rod( high strength, low temp solder), then mill or surface grind to the half diameter/blade joint. Then file to same profile as other side. Or- turn to full diameter, offset in 4 jaw, turn small section to less than radius, die cut small thread, drill and tap blade, turn in, lock tite and brad the end in countersink , mill or surface grind to half diameter, refit as before. This is just on challenge, I missed the fact, at first, that it was selective ejectors.
Mike