Honestly, I’m not sure how I used to do the vanishing birdcage. I think I was very lucky in that years ago it never really hung up on my sleeve in a show. I also think that I’m currently more aware of failure without an “out” in tricks that I do in the show. Billy McComb in an interview on the Greater Magic Video Series says, “…there is no out when the cage is hanging out of your sleeve.”
Currently I’m following Tommy Wonder‘s advice. Every time the cage snags on something, I’m trying to figure why it snagged and what I can do to stop it from snagging. It’s a smart approach, and one that’s a lot of work and will end up with a fairly altered jacket.