Folding Travel Spiral by Top Hat Productions - Trick

I bought this to replace my NON-folding spiral. The old one goes over great with audiences. I used the new folding version this week for an audience of about 150 and NO ONE perceived the illusion. With larger audiences often a few can't see it. But no-one - ouch. I repeated it three times - each time with added embarrassment. The adult audience was clueless. The spiral seemed to slip in my B&D cordless screwdriver. Perhaps that was enough to ruin the illusion. I'll buy a wrench and...