Hey guys, Looking to get the supplies to sweep my stove pipe for the first time. My setup has 2 45's to create about 8 inches of offset above the stove to connect to 17' of class A. Access to the top of the chimney is good. I'm hoping to be able to sweep from the top down and through the two 45's to the stove. Is this feasable? If so, should I get 1/4" rod instead of 3/8"? Would 20' of 1/4 rod be too flexible to run the brush up and down? Do I want a poly brush for my stainless class A? Thanks in advance!