Mmm...I overlooked my own thread for a while. :sleep:
Thanks for the replies, guys.
Thanks to your description, Pete, I remember how Abbott's trick bottles are constructed. Quite a different concept than the current sets.
Just as you said, Larry, they don't seem to be available anymore. Ebay wasn't a help yet, but I'm hoping to find a set one day.
Gord, I'm working alone, yet I like the idea of letting someone else put the shell into the tube.
I took Spellbinder's advice and constructed a new set. The tubes are made of thin but very strong carboard and as in the orginal set I have a beer and a milk bottle. During the routine the magician's and the spectator's bottle are switched. At almost the end the spectator succeeds and the magician is proven to be wrong. The routine finishes with a surprise production for the spectator from one of the tubes.
The routine is my take on German magician Jochen Schmeck's routine and is one of the highlights of my show. I'd hate to change the routine as it is...