As I was using this product, the first segment and brush head unclipped and came loose within the chimney, falling down and getting stuck on a bend with a sickening thud. My heart sank... Luckily, I was able to push it downward with the extra rods, around a few bends and get it out of the bottom! After that I decided to use duct tape on every joint for extra insurance, making sure to wrap the tape in the opposite direction of the drill's rotation (don't need it coming unwound in the chimney). This worked great! My suggestions would be 1. Tape all joints! 2. Get a few more rods than you think you'll need. You never know when you'll need the extra length to push some rods out that you may drop. 3. Have a helper at the opposite end to remove the brush once it comes through (the brush prevented mine from going back up, once through).