Hmmmmm ... Didn't see the question.
I'm converting one right now, and have the switch cut down and modified to switch the hot lead (+) instead of ground (-). The only thing delaying me is trying to figure out what to do about that hopeless lens in the Dorcy. The cheapo plastic lens didn't bother me all that much when I put an Opalec in one, but I figure my BB400 would like a better view of the world.
I've got pics of the Dopalec in a couple of other threads, and a request for suggestion on the head in another (with a pic).