It arrived; glass is perfect but most accessible screws are loose (who knows about the inaccessible ones?), the one-touch zoom can't hold itself tilted away from horizontal.

I tightened everything I could reach. I think optically it'll mount on the Deckel mount OK without vignetting, but I gotta deal with the next level of looseness (internal). That part's getting scary (tore it down as far as I could without problems rebuilding) so I better find someone else who's done the next level of teardown so I don't end up with a bucket of parts.