I had a lot of trouble with mine. It may have had something to do with my flue being 7x11 and thus the rod being able to swim around too much. I pushed the thing up one rod at a time. When I turned the drill on, it set up such a twist in the rod that you could not use it. The thing was pouncing off the flue walls with that hard ball ricocheting off the flue sides so hard that I got concerned with actually busting one of the flue tiles. My chimney is 25 ft tall and I sent it through the clean out door. It had to bend 90* but I tried it twice and found it easier just to climb the roof and sweep the chimney with the brush as I always had.
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