Trap doors on butt caps

Q: Is there an easy way to determine if a racquet has a removable “trap door” in the butt cap and if the handle is hollow or foam filled? By easy, I mean without removing the grip and the butt cap.

A: A “trap door” is nothing more than a removable butt cap insert. Not all racquets have one, but it is easy to tell if a butt cap has a “trap door,” as there will be a small opening into which you can put the tip of a screwdriver to pry out the insert.