I have a 6 in. round poly chimney brush that is much stiffer and / or a bit larger in diameter than I want. Working from the roof with the very lightly sooted chimney at chest height the brush goes down hard until the transition to the the vertical double wall stove pipe where it sticks. Then it is a bear to get the bristles to flip to pull up where it still goes pretty dry. Taking the straight stove pipe off to clean separately is a real pain as it goes through the cookstove’s warming oven. My previous Waterford Stanley just had a warming shelf which made removing the pipe easier. Moving the brush shouldn’t be that difficult. I’m looking for one that is more workable. I think this one is an Imperial.