Besides looking horrible, tape won't last too long and I wouldn't use just any automotive weatherstrip adhesive. Some of the weatherstrip adhesives for automotive uses are not meant to have movement on them once they are cured. Meaning the weatherstrip stays put. Your bellows has some movement and could loosen from automotive weatherstripping adhesive. Here is a link to the post from when i got my 23C http://www.apug.org/forums/forum43/1...-enlarger.html For re-gluing the bellows Pliobond was suggested. It stinks horribly for a week or so but it works fantastic for the job. Post pictures before gluing or taping so we can fully understand what you need to fix. Where the bellows goes onto the condenser lens (the round section) it is supposed to "float" on that. Mine had come loose from the end of the bellows where the negative holder is.