though a bit sad for the white 18-55mm lens.
The DAL 55-300 arrived, and sure enough only the mount itself was broken in a couple of places - no contact-pin or aperture-lever issues at all. I compared screw-points to other spare lenses, but Sigmas use fewer screws so the spacing was off - so that left the DAL 18-55 mount. That's too bad as the white DAL was a fine match to the upcoming K-s1, but I have a WR version on my K-5 that makes it expendable. I suppose it would be practical to swap my DA WR for a white DAL WR, if any K50 users are up for it; that would be pretty on the K-s1 yet functional on my K-5. Takers, anyone?
After about a half hour of slow-motion detail work, I now have a fine copy (again) of the DAL 55-300 lens! How nice.
p.s. I modified my K-s1 preorder to be a black body - far less effort than working in a white lens!