hey Dave,
I've had an Acrobatic Matchbox for probably over 30 years now. I just read your review and thought I could be of some help. Not knowing how this "new" one operates, I can only assume that you are having trouble hiding the thread. Try this, when you approach someone, have the box on your hand, ready to perform. Then make sure the line is underneath your forearm!...this hides the gimmick perfectly.....I hope this helps. Peace, Don P.