Thank you everyone for the kind remarks - praise indeed coming from such experts! (...) minimal: (URL) (...) Eagerly awaiting the results! (15 years ago, 10-Dec-09, to lugnet.technic)
...well, the smallest I can manage, anyway. Of course, I am hoping to see some challenges to this claim! :) Fully automatic - needs only an air supply. Uses two small cylinders and two switches. Roughly 9x9x12 studs in size. I found the small (...) (15 years ago, 6-Dec-09, to lugnet.technic, lugnet.announce.moc) !