To get the ejector reinstalled with the BB behind the spring, put it all together then hold the barrel vertical on a hard surface, push down on the barrel to push the ejector into position, then insert a punch thru the pin way as a slave pin to align things, knock the roll pin in from the opposite side as it pushes the punch back out. I've done several this way, works fine, just requires a little yankee ingenuity.
I've added this tip to the FAQs so the next one to try it doesn't need 3 hands too!!
Glad ya got it whipped!!
Tim