I’ve been using the sooteater to sweep the chimney for the last 10 years or so, and it worked very well. Overtime, the head has worn away enough where I don’t believe it can make contact with all parts of the liner any longer. I bought a new head to it and I’m wondering how much excess. I should leave on the head of it. Not sure if I left too much if it would be a pain in the ass to move the head up and down in the liner itself when I swept. For reference, I have a 6 inch heavy wall liner.