I bought one of those DIY flue cleaners with the flexible rods, thinking I'd clean the stove myself, but the ~2" diameter cleaning head doesn't fit through any flue opening I seem to have access to. I tried going up through the catalytic converter opening and also tried to fish it up from inside the stove (adjusting the bypass to maximize the opening in both cases), but no luck. It probably would be more sensible to disconnect the flue pipe, but I have no idea how to do this. Any ideas? Can I remove the stove outlet? This is a Series 8. I don't have roof-access and the sweeps never go up there, so there must be a way to do this. Maybe they're using a smaller diameter cleaning head?